Killshot II 4-bbl EFI System Master Kits
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
Magnetic Distributor of your choosing
Ignition Coil
Fuel System of your choosing
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!
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.
Your choice of fuel system
Versatile options to meet your needs.
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Your choice of distributor
Choose from 13 common fitment, magnetic pickup distributors that we offer, with more options coming soon!
Choose from 13 common fitment, magnetic pickup distributors that we offer, with more options coming soon!
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.
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
CFM Rating
800 CFM
Material
Cast Aluminum (throttle body)
Ported Vacuum
Yes
Air Cleaner Diameter
5"
Throttle Body Height
3-5/16”
MAP Sensor Rating
3-bar
Inlet/Outlet Size
-6 AN
Injector Size
100 lb/hr
Fuel PSI Required
42-48 PSI, 60 PSI max
Boost/Nitrous Compatibility
Compatible, yes. Control requires a separate module.
Available Finishes
Black ceramic, gold, pink, or polished
HP Rating
650 HP (naturally aspirated)
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