AuxJection LT4 auxiliary fuel injection system with aluminum plate installed on a Camaro ZL1, data-validated for 1130 HP and perfect cylinder distribution.

AuxJection | LT4 Stock Supercharger

Name: AuxJection | LT4 Stock Supercharger
Rating: 5.00 (13 reviews)

$1,800.00 USD

Shipping calculated at checkout.

PLEASE READ BEFORE ORDERING:

Important fitment, tune file, install, and first-flash instructions are included in the dropdown sections below.

Read all product information before placing your order.

VEHICLE

FLEX-FUEL SETUP

AuxJection Plate Finish

Custom tune file required (1-3 business day turnaround)

Engineered, Manufactured, and Assembled in the USA

Need more fueling than the LT4 DI system can support, but don’t want to rely on meth injection or invest in a full port-injection setup?

AuxJection fills the gap with a clean, factory-style solution that installs easily and integrates seamlessly with the ECU.

HOW IT WORKS

AuxJection is a fully integrated auxiliary fuel-injection solution engineered to work within your vehicle's factory ECU—no external controllers, or piggybacks required. By utilizing custom ECU software (detailed instructions provided in your kit) that gets written to the ECU, AuxJection drives additional port-style injectors with the same precision you would expect from the stock controller.

AuxJection's internal calibration logic uses real-time ECU data to calculate and deliver auxiliary injector pulse width on the fly when a user-specified duration of direct injection window is met. After installation, the vehicle tunes no differently than if it were equipped with a higher-capacity fuel system from the factory.

The included fuel line set reroutes the low-pressure feed from the DI system at the firewall, through the throttle-body assembly, and returns it to the DI system inlet—allowing the auxiliary system to share the OEM low-pressure circuit without modifying factory hard lines. The plug-and-play harness combined with the pre-made fuel lines make this kit the EASIEST installing product on the market for adding an auxiliary fuel source.

COMPATIBILITY:

Only compatible with stock LT4 supercharger platforms and LT1/LT4 Whipple 2.9L/3.0L
Compatible with stock throttle body up to 103mm bore
Adds approximately 1 inch to the supercharger snout
Depending on your intake, minor tube or coupler modifications may be required
This product does not fit Camaro ZL1 with a standard Roto-Fab intake
Roto-Fab Big Gulp and JLT large tube intakes are compatible with minor modifications; fitment of other large tube intakes is not guaranteed
May have belt-to-throttle body clearance issues with aftermarket idler relocation brackets; fitment is only guaranteed with the stock belt drive setup
DO NOT use with VP Import, Q16, or other MTBE oxygenated fuels

FLEX-FUEL SETUP OPTIONS:

OPTION 1: I Already Have a Flex Fuel Sensor – Includes the AuxJection harness, integrated flex-fuel sensor wiring, and required fittings. Your existing flex-fuel sensor will be reused.

Note: Flex-fuel sensor must be mounted in the same location as shown in the product photo. If you already have a flex-fuel kit installed, proper fuel line fitment cannot be guaranteed, as the lines are designed for a specific routing configuration. Existing hardware may need to be removed, but your sensor can be reused.

OPTION 2: Add a Flex Fuel Sensor – Includes AuxJection harness, required fuel line fittings, and flex-fuel sensor for a complete installation.

IMPORTANT:

Custom ECU software is required. You must send us your current tune file to modify. (See custom software | tune file process dropdown below)
AuxJection will not function until the modified file is written to the ECU. *ECU flashing tools are not included.

READ THE DROP-DOWN MENUS BELOW BEFORE ORDERING AUXJECTION

Billet throttle-body flange with matching fuel rail (compatible with stock throttle body up to 103mm bore)
(2) FID2200 Injectors - flow-matched pair
Pre-assembled, crimped PTFE AN fuel lines with all required fittings
Plug-and-play wiring harness

Download the full PDF instructions below in the Installation Guides dropdown

Each AuxJection kit includes an instruction card with your Kit ID #.

Use the steps below to generate your custom tune file:

Email: AuxJection@wisherperformance.com
Subject Line: Your VIN # _ Your Kit ID # [Example: 1G1Y82D47L5000324_#010126_01] *Include both VIN and Kit ID # to avoid delays
Attach Your Tune File: Accepted formats: .HPT or .BIN
Turnaround Time: Your modified file will be returned within 1-3 business days

Once your file is received: You MUST "WRITE ENTIRE" for the first flash. Failure to do so will result in the system not functioning.

Camaro ZL1, Corvette Z06, Cadillac CTS-V

AuxJection Stock LT4 Supercharger Downloadable PDF

AuxJection Kit Youtube Install Guides

Horsepower Patriots - C7 Z06

Flex-Fuel (E85) YouTube Install Guides

Flex-Fuel Kit (E85) – 2014-2019 Corvette

Flex-Fuel Kit (E85) – 2016-2024 Camaro

Looking for the full breakdown on AuxJection? View our FAQ for answers about fueling, supported applications, installation, tuning, and setup requirements.

View the full AuxJection FAQ here

5 stars: 13 (100%)
4 stars: 0 (0%)
3 stars: 0 (0%)
2 stars: 0 (0%)
1 star: 0 (0%)

Horsepower Goal Achieved: Yes

This system is the most complete and easy to install aux fueling on the market! The system integrates seamlessly with the factory ecu so tuning is a breeze. You tune as normal and pretend the auxjection isn’t there. All of my big HP customers will be getting the Wisher Auxjection! - Blazing High Performance

What Stood Out: Great customer service and product

Horsepower Goal Achieved: Yes

Vehicle Setup: Kong X Port, upper, lower, NW103, Rotofab Big Gulp, Full exhaust, E70

Total Game changer! Very clean and easy install. I Have installed multiple kits and every one of them gains over 100Whp/100Wtq utilizing AUXJECTION.

What Stood Out: Customer service was great. Responded very quickly.

Horsepower Goal Achieved: Yes

Vehicle Setup: 2019 Z06 Corvette.

So far so good! The shop owner/car builder was very impressed with the unit. It was his first time installing and tuning an Auxjection unit. The added fuel and the ability to run full E85, the car made about 100hp more with AuxJection over pump 93.

Seeing a 100hp jump on full E85 over pump 93 is awesome! It’s great to hear that it was a smooth first time install and tune for your builder, too. Thanks for highlighting our customer service!

Let us know if you or the shop ever need anything else!

What Stood Out: Quick file modification turn around time and a product that works as Intended

Horsepower Goal Achieved: Yes

Vehicle Setup: Cam, Ported Blower, auxjection

Wisher AUXjection works exactly as advertised. I recently used it on a 900 WHP 6th gen Camaro build, and it performed flawlessly. From a tuning standpoint, the integration is seamless no workarounds, no gimmicks, and no headaches. It does exactly what it’s designed to do. Highly recommend it to anyone looking for a reliable auxiliary fueling solution that also cuts down manifold air temps!

Appreciate the killer review, Anthony! A 900 WHP 6th gen is no joke, so hearing that the AuxJection kit integrated seamlessly and kept those manifold temps down is awesome. Glad we could get that file modification back to you quickly, too.

What Stood Out: Fast shipping and great customer support

Horsepower Goal Achieved: Yes

Vehicle Setup: Kong x port, 9.45 lower with stock upper, dsx aux pump, and fbo

Works fantastic! Easy to tune and the kit is top notch. I like this solution over meth and port injection due to cost factor and reliability. A+ product!

Thanks Armin! We appreciate the feedback and are so glad to hear AuxJection is working well on your setup. Awesome combo!

What Stood Out: The flawless integration doesn’t come out looking too far from stock and it just works flawlessly!

Vehicle Setup: 2022 camaro zl1 m6, btr stage 2 blower cam, all supporting mods for everything heads studs, headers, supercharger porting, supercharger cooling mods and auxjection system

The whole kit and install is flawless especially with the right fueling system and supporting mods makes your car an absolute rocket!

What Stood Out: The quality and innovative design.

Horsepower Goal Achieved: Yes

Vehicle Setup: Current customer build is a 2023 Camaro SS, 3

The products from Wisher performance are top notch. I would highly recommend WP for all GM performance tuning and fuel systems.He does all the tuning for the vehicles that I build for my customers.

What Stood Out: Very nice kit

Vehicle Setup: 2019 CTS-V

Worked as advertised. 49 rwhp gain just by swapping to flex fuel.

What Stood Out: Simple, very fast shipping and processing. Caleb has been fantastic on the customer service side.

Vehicle Setup: 2015 C7 Z06, 5" BIG GULP, 103 NW TB, JOKERZ PORTED BLOWER,DSX LID, C&R SLANTED BRICK CONVERSION 2.3 UPPER, FLEX SENSOR, 2" HEADERS, OFF ROAD X PIPE, CORDES EXPANSION TANK, DSX LOW SIDE

I just received my first few kits and was pleasantly surprised! The auxjection plate is O-ring sealed on both sides and mates up to my Jokerz ported snout very nice. No more making a gasket or using RTV to seal the the 103 throttle body to the snout with the oem gasket groove ported away. The wiring harness is oem quality nice, the fuel lines are cleanly put together. I have not installed the kit yet but first impression upon unboxing is impressive and flawless!

Thank you, Matthew! We really appreciate the detailed feedback.

Hearing that the plate design, O-ring sealing, harness quality, fuel lines, shipping, and support all stood out right away means a lot. A lot of thought went into making the kit clean, straightforward, and easy to work with, so we’re glad that came through on first impression.

Awesome setup, and we are glad to have you working with us as an AuxJection dealer. We appreciate you!

What Stood Out: Actually works as intended and described

Horsepower Goal Achieved: Yes

Vehicle Setup: This particular car is a 2024 Zl1 with cam package and supercharger work

Incredible system, works exactly as described

We love hearing that! We appreciate you taking the time to drop us a 5 star review, Ryne!

What Stood Out: The communication back and forth is extraordinary!

Horsepower Goal Achieved: Yes

Vehicle Setup: 2022 Camaro 2SS 3.0 Whipple with supporting mods

Everything was as described, included all needed tools and parts to complete. It is sleek and has an extremely clean look when installed. Wisher Performance is also incredibly easy to communicate with and always timely!

Thank you, Dylan! We really appreciate the detailed feedback and your support. We're glad the kit was clean, complete, and easy to work with. Communication is a big part of what we care about, so it means a lot to hear that stood out.

What Stood Out: Quality and functionality

AWESOME PRODUCT!!!!!!

Thank you, Chase! We really appreciate the support, not just on the order, but from the very beginning. You were one of the first to take a chance on AuxJection, and that played a big part in helping us get this product moving.

We're glad to hear you're happy with the quality and functionality. That means a lot coming from you.

Thanks again for the continued support and for being a part from the start!

Questions & Answers loading...

Product Disclaimer:

Results will vary based on your vehicle setup, tuning, and fuel system condition. Proper installation and calibration are required. Wisher Performance is not responsible for damage caused by improper installation, insufficient fuel supply, or incorrect tuning.

AuxJection is a Wisher Performance aftermarket product designed for compatible vehicle and supercharger applications. Manufacturer names are used only to identify fitment and compatibility. AuxJection is not manufactured, endorsed, approved, sponsored, or warrantied by Magnuson Superchargers, General Motors, Chevrolet, Cadillac, or any related manufacturer.

⚠️ California Proposition 65 Warning:

This product may expose you to chemicals known to the State of California to cause cancer and reproductive harm.

See full terms in our footer policies.