The Future of Throttle Body EFI is Here

Engineered Precision. Integrated Simplicity. Real-World Durability.

The Killshot Fusion is the next evolution in throttle body EFI systems. Building upon the success of the original Killshot, the Fusion takes everything users loved, robust hardware, accurate fuel delivery, and ease of tuning, and reimagines it with a fully integrated design that eliminates clutter, simplifies installation, and dramatically boosts reliability.

In a world where many EFI manufacturers rushed to integrate ECUs onto the throttle body and paid the price in failures, Aces EFI took a different path: more time, more engineering, and more testing. The result is Killshot Fusion, a true all-in-one TBI system that thrives where others fail.

Built from the Core Up – Smart, Strong, Stable

At the heart of the Killshot Fusion is a high-performance 32-bit automotive-grade microcontroller based on the PowerPC e200z0h core. This platform enables lightning-fast input/output processing, superior sensor management, and high-resolution fuel and spark control. Combined with Aces’ proprietary software and a proven B50 control chip, it delivers performance you can trust in any application, from street cruising to competitive racing.

Fusion also includes advanced ECC memory protection, a Memory Protection Unit (MPU), and a 4-layer PCB with a dedicated power plane. This design significantly reduces voltage fluctuations and impedance, ensuring system stability and durability, even in extreme environments.

Re-Engineered for the Harshest Realities

Many EFI systems fail because they ignore the reality of engine bay conditions, heat, vibration, electromagnetic interference (EMI), and moisture. The Killshot Fusion addresses each of these with purpose-built solutions:

• Potting-Protected ECU: The Fusion’s internal PCB is encapsulated in specialized potting material that insulates electronics from heat and shields against vibration, impact, and contamination.
• Dual Ignition MOSFET Drivers: Enhance ignition reliability by providing strong and stable spark energy under all conditions.
• Multi-Stage Filtering & Active Digital Shielding: Prevents noise interference from ignition systems and surrounding electronics, preserving signal clarity.
• EMI & Environmental Testing: The Fusion has passed extensive vibration, salt spray, and EMI validations, tests where competitor systems often fail. This isn’t just rugged, it’s refined, lab-proven durability.

Integrated Design, Maximum Simplicity

With the ECU and harness connectors integrated directly onto the throttle body, installation is faster, cleaner, and more reliable. There’s no need to mount an external ECU, route long harnesses, or deal with complex wiring. Just bolt it on, plug it in, and fire it up.

• Symmetrical Harness Layout: Connectors on both sides of the unit allow for clean cable routing no matter your engine bay configuration.
• Reduced Points of Failure: Fewer connectors and wires mean fewer potential problems down the road.
• No External ECU: Fewer boxes, fewer mounting brackets, and a dramatically cleaner engine bay appearance.

Advanced Software with Self-Learning Intelligence

Killshot Fusion’s control software doesn’t just respond to your engine, it learns it. Every second the system is running, it’s analyzing, adapting, and refining its control strategy for your unique build.

• Predictive Ignition Timing: Software anticipates and adjusts spark timing for optimal combustion under dynamic conditions to better meet timing targets.
• Accurate Injector Phasing: Improved synchronization between injectors enhances performance and fuel economy.
• Rapid Self-Learning: The ECU quickly adapts to your engine's fueling needs—no laptop required during setup.
• Anti-Interference Control: Predictive shielding algorithms mitigate signal disruptions before they occur.

Whether you’re adjusting idle quality or optimizing for boost, Fusion’s software is tuned to perform.

Performance Hardware – Loaded and Ready

• (4) 100 lb/hr Injectors – Supports up to 650 horsepower
• Integrated Coil Driver – For direct ignition control
• Step Retard – Built-in timing control for nitrous applications
• Boost-Ready – 3-bar TMAP sensor included for high-performance turbo or supercharged setups
• Built-in Sensors – MAP, TPS, IAT, and 4.9 Wideband O2 included
• Dual Fan Control – Optimize cooling strategy
• 5” Full-Color Touchscreen Handheld – Includes GPS speedometer, monitoring, and intuitive setup wizard
• Advanced Tuning Software – Free laptop-based tuning with pro-level tables and live data
• Fully Compatible – Works with Aces CAN accessories, digital dashes, and transmission controllers

Why Killshot Fusion? Why Aces EFI?

While others shipped flawed designs to meet a trend, Aces EFI held the line—refining, validating, and testing until we had a product worthy of our name. The Killshot Fusion is the culmination of five years of ECU and TBI development, engineered specifically for real-world performance and long-term reliability.

From weekend warriors to serious tuners, Killshot Fusion offers the confidence of clean installation, the control of pro-level tuning, and the backbone of proven engineering.

If you’re ready for a throttle body EFI system that does more than look the part, this is it.

The Killshot 2 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 2, 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 2 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 boosted setups, 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 2 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 2 delivers the reliability and performance you need.

Maintaining proper fuel pressure is critical for EFI performance. With Killshot 2'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 2 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 2 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 2’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 2 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 2, 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 2 is built to handle it all.

Formerly called the "Killshot Classic"

Have you ever thought about EFI for your project, but were intimidated by the installation process, or worried that the typical 650HP-rated TBI system was too much for your stock or lower-powered engine? Aces has listened and developed the Killshot Lite to better suit those applications.

Key Features:

• Plug and play
• 400 HP
• Easy install
• 5”handheld with GPS speedometer
• Next level RFI / EMI protection
• Base calibrations set in a real world environment
• the most affordable upgrade

The Killshot Lite has (4) 65 lb/hr injectors and is 400 HP capable. Timing control has been removed, allowing an easier installation with your existing distributor. The base calibration installed in the unit is for a mild 350 SBC with an HEI distributor and is easily scaled for other displacements. The TPS, IAC, and TMAP sensors are integrated into the unit for simpler wiring. Dual electric fan controls are retained, as well as an easy-to-use touchscreen, handheld controller for initial setup, tuning, and gauge displays. All of this means that you will spend less time with setup and be able to get your vehicle back on the road quickly!

Simpler installation, improved drivability, and at a lower cost! The Killshot Lite is the best option for your truck, daily driver, or mild cruiser!

Aces' Killshot EFI system is one of the most advanced throttle body injection (TBI) systems on the market. The Killshot utilizes four 100 lb/hr fuel injectors, giving the system the capability of supporting up to 650 horsepower. The system includes the throttle body (with integrated fuel injectors, TPS sensor, MAP sensor, IAT sensor, and stepper motors), wiring harness, WBO2 sensor, ECU, and a 5” touchscreen handheld programmer for easy tuning and monitoring of engine data. 

The Killshot system fits most 4150-flange 4-barrel intake manifolds and is designed for easy installation and tuning. For stock to mild applications, the calibration wizard and self-learning features mean advanced tuning knowledge or experience is not required. But for more aggressive or performance oriented applications, Aces offers a full tuning software suite and USB data cable for advanced manual tuning.

Aces designed its throttle body systems with the ECU separate from the throttle body. This alleviates any issues with possible damage to the ECU from unwanted engine heat or vibration. This is a common problem with other “all-in-one” style systems on the market.

Whether you are building a budget beater or a boosted racing car, Aces EFI’s Killshot system has the technology and advanced features you need, in an easy-to-install, easy-to-tune package so you can take your ride to the next level!

For timing control, the Killshot requires a magnetic pickup or hall effects distributor and separate ignition coil. We recommend our Black Jack Pro series distributor and ignition coil for a plug & play experience.

Aces EFI Killshot™ TBI System Features

32-bit software (OEM standard) that manages input/output signals, voltage, and RPM faster and more consistently than competitors

5” full-color touchscreen handheld with built-in GPS speedometer

Integrated coil driver for ignition timing control

Simple calibration wizard for initial setup- no laptop tuning required.

Self-learning fuel table

Dual fan control

Step retard for nitrous control

Boost compatibility (using laptop software)

Remote-mounted ECU to avoid common heat/vibration-induced hardware failures

3-bar TMAP sensor for boost & nitrous compatible (using laptop software)

Free laptop software available for pro applications

Compatible with Aces’ handhelds, dashes, CAN modules, and TCMs.

Bosch 4.9 WBO2 sensor

(4) 100 lb/hr injectors

Aces EFI’s Royal Flush EFI/CDI is the most powerful TBI system on the market! Integrating our EFI control module and CDI ignition system inside one ECU, this is a revolutionary upgrade and huge leap forward in the world of aftermarket EFI products. By using CDI, you are able to create a much hotter spark in order to burn fuel more efficiently and ensure maximum power, especially in boosted and performance applications.

The Royal Flush EFI/CDI system utilizes four 100 lb./hr. fuel injectors, giving the system the capability of supporting up to 650 horsepower. The system includes the throttle body (with integrated fuel injectors, TPS sensor, MAP sensor, IAT sensor, and stepper motors), wiring harness, wideband O2 sensor, ECU, and a 5” touchscreen handheld programmer for easy tuning and monitoring of engine data. 

The system fits any 4150-flange 4-barrel intake manifold and is designed for easy installation and tuning. Installation is straightforward and easy, and the system includes everything you need to get on the road or track quickly. For stock to mild applications, the calibration wizard and self-learning features mean advanced tuning knowledge or experience is not required. But for more aggressive or performance oriented applications, Aces offers a full tuning software suite and USB data cable for advanced manual tuning.

Aces designed its throttle body systems with the ECU separate from the throttle body. This alleviates any issues with possible damage to the ECU from unwanted engine heat or vibration. This is a common problem with other “all-in-one” style systems on the market.

Whether you are building a budget beater or a boosted racing car, Aces EFI’s Killshot EFI kit has the technology and advanced features you need, in an easy-to-install, easy-to-tune package so you can take your ride to the next level!