Wisher Performance AuxJection Kit | 2022-2026 Cadillac CT5-V Blackwing

Wisher Performance AuxJection for the 2022-2026 Cadillac CT5-V Blackwing

AuxJection is a factory-ECU-integrated supplemental fuel-injection system for the supercharged 6.2L LT4 in the CT5-V Blackwing. It adds two port-style injectors without an external controller or piggyback.

Verified compatibility

• 2022-2026 Cadillac CT5-V Blackwing, 6.2L supercharged
• Wisher lists compatibility with the stock LT4 supercharger, Whipple 3.0, and Magnuson 2650 platforms. This SMG listing currently provides selectable configurations for the stock LT4 and Magnuson 2650.
• Stock throttle body through 103mm bore
• Stock throttle body and stock intake fit without modification
• JLT 5-inch intake with a 103mm throttle body requires Wisher's 5-inch-to-103mm low-profile coupler
• Fitment is guaranteed with the stock belt drive and TooHighPSI Slayer; other idler-relocation arrangements may create clearance issues

The assembly adds approximately one inch at the supercharger inlet. Other large-tube intake combinations may require modification and are not guaranteed.

How it works

Custom ECU software uses live ECU data to command the auxiliary injectors. The included fuel-line arrangement shares the factory low-pressure circuit without modifying the original hard lines.

Important requirements

• A custom tune file from Wisher is required; typical stated turnaround is 1-3 business days.
• The first flash must be performed as a “Write Entire.” ECU flashing hardware is not included.
• Select whether you already have a flex-fuel sensor or need one included, then choose aluminum or black-anodized finish.
• Do not use VP Import, Q16, or other MTBE-oxygenated fuels.

SMG has a production kit inbound for hands-on installation, testing, and original shop content.