Killshot II 4-bbl EFI System
Includes the following free item!
Free shipping on orders over $200! (Lower 48 states)
Add a PDM to protect your system and clean up your wiring! See details here
What's in the box?
Killshot II Throttle Body
Killshot II ECU
5” HD Handheld with built-in GPS
Main Harness
Sub-harnesses
USB CAN Cable
4.9 WBO2 Sensor
Coolant Temp Sensor
Weld-in O2 Bung
Additional Hardware
Technical support
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Power Distribution Module (PDM)
Discover the next evolution in performance and reliability with the Aces Fuel Injection Power Distribution Module (PDM) —your ultimate solution for seamless power management in high-performance EFI systems. The PDM uses IGBT transistors in the place of solid state or electro-mechanical relays which helps to filter bad transient voltage, ultimately providing greater protection for your electronics which are connected to the PDM.
Our PDM is engineered to integrate effortlessly with Aces Fuel Injection Systems, providing robust, efficient power distribution for essential components such as:
- Ignition Systems
- Fuel Pumps
- Cooling Fans
- Auxiliary Accessories
Key Features
- Comprehensive Power Management: Supports ignition, fuel pumps, fans, and more.
- Simplified Wiring: Clearly marked terminals for ease of installation.
- Enhanced Safety: Fuse-protected circuits for optimal performance and reliability.
- Flexibility: Tailored control for auxiliary devices with relay support.
Pressure Sensor Kit
Aces EFI pressure sensor kits utilize top-quality parts for use with EFI systems. Kits include plastic/steel sensors with 1/8" -27 NPT threads and include a -6 AN fuel pressure take-off adapter fitting and 2 sets of 45 push lock hose ends.
Pressure sensors are great for logging oil pressure, fuel pressure, or boost pressure. Display the pressure reading on any Aces Handheld or Dash screen and on your data log files!
EGT CAN Module Kit
High-Performance Tuning with the Aces EGT Module
When it comes to high-performance tuning, accurate Exhaust Gas Temperature (EGT) monitoring is crucial. Whether you're running a naturally aspirated, turbocharged, or nitrous-fed setup, precise temperature data helps you optimize fuel tuning, prevent engine damage, and maximize efficiency. The Aces EGT Module is built for precision, durability, and seamless integration, ensuring you get real-time data to fine-tune your engine like never before.
Why You Need the Aces EGT Module
- Prevent Engine Damage – High exhaust temperatures can lead to pre-detonation, melted pistons, and turbo failures. Monitoring EGTs allows you to adjust fueling and timing before damage occurs.
- Optimize Air/Fuel Ratios – Fine-tune your AFRs based on real-time EGT data for better power, efficiency, and reliability.
- Monitor Cylinder Balancing – Detect uneven fuel distribution or ignition issues to avoid power loss and potential engine stress.
- Essential for Forced Induction & Nitrous Builds – Turbocharged, supercharged, and nitrous-fed engines run hotter. Accurate EGT readings ensure you're not pushing past safe limits.
- Seamless Integration with Aces EFI Systems – Easily expands via CAN connectivity to work with all Aces controllers and displays.
Aces EGT Module Features
- 32-bit RISC-V Core Processor – Ultra-fast processing for real-time data accuracy.
- 480MHz Multi-Stage Pipeline Processor – Handles high-speed temperature changes with precision.
- Hardware Floating-Point Unit (FPU) – Ensures stable, high-speed calculations for consistent performance.
- 16-bit ADC for High-Precision Signal Acquisition – Delivers accurate, reliable temperature readings.
- Supports 2 or 4 EGT Channels – Ideal for both single-bank and dual-bank monitoring setups. (2 channels for two banks, 4 channels for one bank but 4 per exhaust runner)
- Automotive-Grade Type N Thermocouple Sensor – High-durability sensor for extreme conditions.
- Wide Temperature Measurement Range – Capable of reading from -150°C to 1024°C with a rapid 150ms response per channel.
- High-Quality Construction – Silicone fiberglass sleeve, PTFE insulation, and Type N thermocouple conductor ensure long-term durability.
- CAN Expansion Accessory – Easily integrates with all Aces EFI units and display modules.
The Aces EGT Module is an essential tool for serious tuners and racers looking for accurate exhaust temperature data, better tuning capabilities, and enhanced engine protection. Take control of your performance with real-time monitoring and seamless EFI integration.
Low Profile Design
A smaller footprint design makes it easier to work with drop-base air cleaners.
Progressive Linkage
Ensures a more gradual and less jarring tip-in response.
650 HP
Single Throttle Body¹
1,200 HP
Ran as dual quads²
Fuel Pressure Sensor
Built-in for less plumbing hassle and a precise reading of your fuel pressure at all times, displayed in the handheld.
Secondary Throttle Body Connection
Enables the use of a dedicated secondary unit³ making the system expandable for dual quad options.
(Requires purchase of secondary unit available early Spring 2025)
Hold your horses
Supporting up to 650 HP and expandable to 1,200 HP by using a dedicated secondary unit, the Killshot II is capable of holding down the fort, and the horses.
Boost it, baby.
The Killshot II has a built in 3-bar TMAP sensor that allows you run draw through or blow through setups and support up to 27 lbs of boost.
Twice the Killshot. Twice the resolution.
Introducing the 3rd generation of our 5" Handheld, now in full 1080 HD. This new generation of handheld is built on a 64-bit RISC-V core processor. This means that graphics load faster, clearer, and smoother, much like a modern smartphone.
If the shoe (throttle body) fits
The Killshot II still uses the common 4150 style flange found on many classic engine manifolds making it a very versatile when it comes to compatibility. As long as the TBI unit fits, is within the appropriate HP range, and your engine uses a classic distributor, it's a match made in heaven...or the garage.
Know with the flow
A built-in pressure sensor gives you real-time, accurate fuel pressure readings at the throttle body, ensuring optimal performance and peace of mind—no guesswork, just precision.
Killshot vs. Killshot II
The Killshot is great, but the Killshot II is even better. See how they stack up against each other below.
650 HP (Single Quad, NA)
650 HP (Single Quad, NA), 1,200 HP (Dual Quad, NA)
❌
✅
❌
✅
❌
✅
❌
✅
4150
4150
32-bit 5" Handheld (2nd gen)
64-bit HD Handheld 5" (3rd gen)
Overview
The Killshot II 4-BBL EFI System is more than just an upgrade—it’s a complete evolution of throttle body fuel injection. Over the past two years, we’ve gathered real-world feedback from tuners, racers, and street enthusiasts to refine and improve every aspect of the original Killshot system. The result is an EFI system that is more powerful, more versatile, and easier to install and tune than ever before.
If you’re still running a carburetor, it’s time to ask yourself: Why settle for outdated technology when EFI offers superior drivability, reliability, and performance? Unlike carburetors, EFI systems automatically adjust fuel delivery based on real-time conditions, meaning no more hesitation, no more cold start issues, and no need to constantly re-jet for changing weather or altitude. With Killshot II, you get precision fuel control, improved throttle response, and seamless adaptability, whether you’re on the street, track, or strip.
At the heart of the Killshot II is a high-performance ECU that offers 32-bit processing, allowing for faster and more precise engine management. Whether you're running naturally aspirated or boost, this system adapts to your setup, providing accurate fueling and consistent power delivery. It comes equipped with a 3-bar TMAP sensor, supporting up to 27 lbs of boost, making it ideal for forced induction applications.
For those looking to push even higher horsepower, Killshot II supports dual-quad configurations, allowing two units to work together to fuel up to 1200 HP (requires an additional slave unit). Whether you’re running a weekend cruiser, a high-compression race motor, or a turbocharged street car, Killshot II delivers the reliability and performance you need.
Maintaining proper fuel pressure is critical for EFI performance. With Killshot II’s built-in fuel pressure sensor, you get real-time fuel pressure monitoring, ensuring consistent fuel delivery under all conditions. This means no more external sensors or guessing—just accurate fuel data at your fingertips.
Advanced Tuning & Control
Tuning your engine shouldn’t be a guessing game. That’s why Killshot II comes with our 3rd-generation 5” HD touchscreen handheld, giving you complete control over your EFI system. With an intuitive interface and Pro PC Tuning Software, you can fine-tune parameters to match your exact performance goals.
- Self-Learning Capabilities – While our system will not “self-tune” in the traditional sense, it does offer advanced self-learning fuel strategies. A base tune is selected based on your engine’s setup, and the system then refines fuel delivery as you drive. This is ideal for stock to mild applications, but more aggressive setups—such as high-lift camshafts, forced induction, and nitrous—will require manual tuning for optimal performance.
- Progressive Linkage for Improved Drivability – Unlike traditional TBI setups that operate more like a digital on/off switch, Killshot II features a progressive linkage for smoother, more linear throttle control. This means better street manners without sacrificing performance.
- Remote-Mounted ECU for Durability – Many EFI systems house the ECU inside the throttle body, exposing it to heat and vibration. Killshot II’s separate ECU design eliminates this problem, ensuring better reliability and long-term durability.
Built for Easy Installation and Maximum Compatibility
EFI conversions shouldn’t be complicated, and Killshot II is designed for straightforward installation. It fits most 4150-flange 4-barrel intake manifolds, and thanks to its low-profile throttle body design, it’s compatible with more air cleaner setups—including drop-base filters.
Additional Features & Compatibility:
- Supports up to 650 HP NA (Naturally Aspirated)
- 4150 Flange – Universal fitment for 4-barrel intake manifolds
- Available in Three Finishes – Black, Polished, and Gold
- Integrated 3-bar TMAP Sensor – Supports up to 27 lbs boost
- Built-In Fuel Pressure Sensor – Real-time monitoring for precise fuel control
- TPS Output – Provides compatibility with other external modules such as trans control, nitrous controllers, etc.
- Standalone or Complete Kit Options – Choose the package that fits your build
With the Killshot II, you get the best of both worlds—the reliability of modern EFI with the power and simplicity of a 4-barrel throttle body system. Whether you’re upgrading from a carburetor for better cold starts and fuel efficiency, or pushing a high-boost application that demands precision fuel control, Killshot II is built to handle it all.
System Specs
Killshot II 4-bbl EFI System Specifications
| Specification | Value |
|---|---|
| Accelerometer Support | No |
| Air Cleaner Diameter | 5" |
| Boost Control | No |
| Boost Compatible | Yes |
| CAN-BUS Support | Yes |
| CFM | 1,000 |
| Coil Per Cylinder Ignition Support | No |
| Datalogging Support | Yes |
| Dry Nitrous Control | No |
| Dry Nitrous Compatibility | No |
| e85 Support | Yes |
| EFI Type | Throttle Body Injection |
| EGT Support | Yes |
| Emission Code | 3 |
| Forced Induction Support | Yes |
| Fuel Filter Included | Only in EFI Fuel Kits & Master Kits |
| Fuel Hose Included | Only in EFI Fuel Kits & Master Kits |
| Fuel Injectors Included | Yes, built in |
| Fuel Pressure Regulator Included | Only in EFI Fuel Kits & Master Kits |
| Fuel PSI Required | 42–48 PSI (60 PSI Max) |
| Fuel Pump Included | Only in EFI Fuel Kits & Master Kits |
| Grade Type | Performance |
| Handheld Included | Yes |
| Handheld MCU Architecture | 64-bit |
| HP Rating | 650 HP (Single Quad, NA), 1,200 HP (Dual Quad, NA) |
| Idle Air Control Motor Included | Built-in |
| Ignition Timing Control | Yes |
| Ignition Type | CDI, magnetic, hall effect, or points style distributor |
| Individual Cylinder Fuel Corrections | No |
| Injector Count | 4 |
| Injector Size | 100 lb/hr |
| Inlet/Outlet Size | -6 AN |
| Intake Manifold Included | Only in certain kits |
| MAP Sensor Included | Yes, built in |
| MAP Sensor Rating | 3 Bar |
| Material | Cast Aluminum (throttle body) |
| MCU Architecture | 32-bit ST56 Power PC |
| Mounting Hardware Included | Yes |
| Multi-Stage Nitrous Control | No |
| Ported Vacuum | Yes |
| Progressive Nitrous Control | No |
| Self-Learning | Yes |
| Throttle Position Sensor Included | Only in Top End and Master Kits |
| Transmission Control | Not built in, but compatible with Aces Trans Control Modules |
| User-Tuneable | Yes |
| Wet Nitrous Control | Yes, but non-progressive |
| WBO2 Sensor | 1 |
Documents
Competitor Comparisons
Holley Sniper 2
ECU Housing
ECU is mounted on the throttle body.
MCU
16-bit
Handheld
3.5" resistive touch screen
Appearance
Several separated cables & wires
Injectors
(4) 100 lb/hr injectors
HP
650 HP N/A
Timing Control & IGBT Driver
Has timing control but no IGBT driver
Spark Energy
-
Retail Price
$1,299.95
Killshot II EFI System
ECU Housing
External, automotive-grade, die-cast aluminum.
MCU
32-bit, ST56 series Power Architecture™ (OEM Standard)
Handheld
5", full-color, capacitive touch screen. Includes built-in GPS chip for speedometer.
Appearance
Only one connector to throttle body (bundled).
Injectors
(4) 100 lb/hr injectors
HP
650 HP N/A
Timing Control & IGBT Driver
Has timing control features and an integrated IGBT driver
Spark Energy
Programmable dwell time. Min. of 90 MJ spark energy when using our AC2008 ignition coil.
Retail Price
$1,099.99
FiTech GoEFI600
ECU Housing
ECU is mounted on the throttle body.
MCU
16-bit
Handheld
3.5" screen
Appearance
Several separated cables & wires
Injectors
(4) 100 lb/hr injectors
HP
600 HP N/A
Timing Control & IGBT Driver
-
Spark Energy
-
Retail Price
$999.99
The Killshot II 4-BBL EFI System is more than just an upgrade—it’s a complete evolution of throttle body fuel injection. Over the past two years, we’ve gathered real-world feedback from tuners, racers, and street enthusiasts to refine and improve every aspect of the original Killshot system. The result is an EFI system that is more powerful, more versatile, and easier to install and tune than ever before.
If you’re still running a carburetor, it’s time to ask yourself: Why settle for outdated technology when EFI offers superior drivability, reliability, and performance? Unlike carburetors, EFI systems automatically adjust fuel delivery based on real-time conditions, meaning no more hesitation, no more cold start issues, and no need to constantly re-jet for changing weather or altitude. With Killshot II, you get precision fuel control, improved throttle response, and seamless adaptability, whether you’re on the street, track, or strip.
At the heart of the Killshot II is a high-performance ECU that offers 32-bit processing, allowing for faster and more precise engine management. Whether you're running naturally aspirated or boost, this system adapts to your setup, providing accurate fueling and consistent power delivery. It comes equipped with a 3-bar TMAP sensor, supporting up to 27 lbs of boost, making it ideal for forced induction applications.
For those looking to push even higher horsepower, Killshot II supports dual-quad configurations, allowing two units to work together to fuel up to 1200 HP (requires an additional slave unit). Whether you’re running a weekend cruiser, a high-compression race motor, or a turbocharged street car, Killshot II delivers the reliability and performance you need.
Maintaining proper fuel pressure is critical for EFI performance. With Killshot II’s built-in fuel pressure sensor, you get real-time fuel pressure monitoring, ensuring consistent fuel delivery under all conditions. This means no more external sensors or guessing—just accurate fuel data at your fingertips.
Advanced Tuning & Control
Tuning your engine shouldn’t be a guessing game. That’s why Killshot II comes with our 3rd-generation 5” HD touchscreen handheld, giving you complete control over your EFI system. With an intuitive interface and Pro PC Tuning Software, you can fine-tune parameters to match your exact performance goals.
- Self-Learning Capabilities – While our system will not “self-tune” in the traditional sense, it does offer advanced self-learning fuel strategies. A base tune is selected based on your engine’s setup, and the system then refines fuel delivery as you drive. This is ideal for stock to mild applications, but more aggressive setups—such as high-lift camshafts, forced induction, and nitrous—will require manual tuning for optimal performance.
- Progressive Linkage for Improved Drivability – Unlike traditional TBI setups that operate more like a digital on/off switch, Killshot II features a progressive linkage for smoother, more linear throttle control. This means better street manners without sacrificing performance.
- Remote-Mounted ECU for Durability – Many EFI systems house the ECU inside the throttle body, exposing it to heat and vibration. Killshot II’s separate ECU design eliminates this problem, ensuring better reliability and long-term durability.
Built for Easy Installation and Maximum Compatibility
EFI conversions shouldn’t be complicated, and Killshot II is designed for straightforward installation. It fits most 4150-flange 4-barrel intake manifolds, and thanks to its low-profile throttle body design, it’s compatible with more air cleaner setups—including drop-base filters.
Additional Features & Compatibility:
- Supports up to 650 HP NA (Naturally Aspirated)
- 4150 Flange – Universal fitment for 4-barrel intake manifolds
- Available in Three Finishes – Black, Polished, and Gold
- Integrated 3-bar TMAP Sensor – Supports up to 27 lbs boost
- Built-In Fuel Pressure Sensor – Real-time monitoring for precise fuel control
- TPS Output – Provides compatibility with other external modules such as trans control, nitrous controllers, etc.
- Standalone or Complete Kit Options – Choose the package that fits your build
With the Killshot II, you get the best of both worlds—the reliability of modern EFI with the power and simplicity of a 4-barrel throttle body system. Whether you’re upgrading from a carburetor for better cold starts and fuel efficiency, or pushing a high-boost application that demands precision fuel control, Killshot II is built to handle it all.
Killshot II 4-bbl EFI System Specifications
| Specification | Value |
|---|---|
| Accelerometer Support | No |
| Air Cleaner Diameter | 5" |
| Boost Control | No |
| Boost Compatible | Yes |
| CAN-BUS Support | Yes |
| CFM | 1,000 |
| Coil Per Cylinder Ignition Support | No |
| Datalogging Support | Yes |
| Dry Nitrous Control | No |
| Dry Nitrous Compatibility | No |
| e85 Support | Yes |
| EFI Type | Throttle Body Injection |
| EGT Support | Yes |
| Emission Code | 3 |
| Forced Induction Support | Yes |
| Fuel Filter Included | Only in EFI Fuel Kits & Master Kits |
| Fuel Hose Included | Only in EFI Fuel Kits & Master Kits |
| Fuel Injectors Included | Yes, built in |
| Fuel Pressure Regulator Included | Only in EFI Fuel Kits & Master Kits |
| Fuel PSI Required | 42–48 PSI (60 PSI Max) |
| Fuel Pump Included | Only in EFI Fuel Kits & Master Kits |
| Grade Type | Performance |
| Handheld Included | Yes |
| Handheld MCU Architecture | 64-bit |
| HP Rating | 650 HP (Single Quad, NA), 1,200 HP (Dual Quad, NA) |
| Idle Air Control Motor Included | Built-in |
| Ignition Timing Control | Yes |
| Ignition Type | CDI, magnetic, hall effect, or points style distributor |
| Individual Cylinder Fuel Corrections | No |
| Injector Count | 4 |
| Injector Size | 100 lb/hr |
| Inlet/Outlet Size | -6 AN |
| Intake Manifold Included | Only in certain kits |
| MAP Sensor Included | Yes, built in |
| MAP Sensor Rating | 3 Bar |
| Material | Cast Aluminum (throttle body) |
| MCU Architecture | 32-bit ST56 Power PC |
| Mounting Hardware Included | Yes |
| Multi-Stage Nitrous Control | No |
| Ported Vacuum | Yes |
| Progressive Nitrous Control | No |
| Self-Learning | Yes |
| Throttle Position Sensor Included | Only in Top End and Master Kits |
| Transmission Control | Not built in, but compatible with Aces Trans Control Modules |
| User-Tuneable | Yes |
| Wet Nitrous Control | Yes, but non-progressive |
| WBO2 Sensor | 1 |
Holley Sniper 2
ECU Housing
ECU is mounted on the throttle body.
MCU
16-bit
Handheld
3.5" resistive touch screen
Appearance
Several separated cables & wires
Injectors
(4) 100 lb/hr injectors
HP
650 HP N/A
Timing Control & IGBT Driver
Has timing control but no IGBT driver
Spark Energy
-
Retail Price
$1,299.95
Killshot II EFI System
ECU Housing
External, automotive-grade, die-cast aluminum.
MCU
32-bit, ST56 series Power Architecture™ (OEM Standard)
Handheld
5", full-color, capacitive touch screen. Includes built-in GPS chip for speedometer.
Appearance
Only one connector to throttle body (bundled).
Injectors
(4) 100 lb/hr injectors
HP
650 HP N/A
Timing Control & IGBT Driver
Has timing control features and an integrated IGBT driver
Spark Energy
Programmable dwell time. Min. of 90 MJ spark energy when using our AC2008 ignition coil.
Retail Price
$1,099.99
FiTech GoEFI600
ECU Housing
ECU is mounted on the throttle body.
MCU
16-bit
Handheld
3.5" screen
Appearance
Several separated cables & wires
Injectors
(4) 100 lb/hr injectors
HP
600 HP N/A
Timing Control & IGBT Driver
-
Spark Energy
-
Retail Price
$999.99
¹System will support up to 650 HP in naturally aspirated applications which are capable of 650 HP.
²System will support up to 1,200 HP in naturally aspirated applications which are capable of 1,200 HP and when using a Killshot II kit in conjucntion with a dedicated Secondary Killshot II throttle body.
³Secondary throttle body not included in the kit by default but is available for purchase