Specific software is required to use this system. Software is included for various vehicles. Software compatibility must be checked before purchase. If no software is found, a software request must be made and filled before purchase. Please contact an importer for support and application guides outside the USA. Software is available in three formats: - For use with stock fueling (T4100003) - - 91 AKI, 93 AKI, 100 AKI, & 104 AKI - - 95 RON, 98 RON, 104 RON, & 108 RON - For use with an APR HPFP and APR LPFP (T4100003-A) (Golf R/S3/TT S Platform Only) - - 91 AKI, 93 AKI, 100 AKI, 104 AKI, & E85 - For use with an APR HPFP, APR LPFP, and APR MPI Injectors (T4100003-B) (Golf R/S3/TT S Platform Only) - - 91 AKI, 93 AKI, 100 AKI, 104 AKI, & E85 GTI/A3/TT platform ECUs have an optional Front Wheel Drive (FWD) file that will limit wheel spin by limiting how torque hits. Any FWD car can choose to run the All Wheel Drive (AWD) file to remove this feature. The software installs to your vehicle's factory ECU. Software can only be installed by an Authorized APR dealer. This system reuses your factory electronic wastegate and electronic diverter valve. To safely achieve the advertised power use an upgraded Intake and Intercooler. To prevent clutch slip use our transmission software or a manual clutch upgrade. Use APR or NGK heat range 9 (NGK-R7437-9) spark plugs gapped to 0.024" ±0.002" or 0.6mm ±0.05mm with a change interval of 10-15,000 mi or 16-24,000 km. Always use a high performance oil with more frequent change intervals. To fit this system with APR Compressor Outlet Pipes, use the APR DTR6054 Compressor Outlet Hose Conversion Kit (MS100213). This kit includes a 1 year warranty (not returns) for manufacturers defects only. Kit must be running APR software with a correct hardware configuration.

Genuine APR. Part number T4100003.

Ships from US warehouse.

WARNING: California Proposition 65 — this product can expose you to chemicals known to the State of California to cause cancer or reproductive harm.

Note: Not CARB approved — not for sale or use on pollution-controlled vehicles in California.