We offer a full line of tuning solutions for the C5 RS6 (2003). We offer industry leading performance.

• Stage 1 (410whp/500wtq) tune designed to work with a stock vehicle. E85 tuning option is not available for this product.
  
• Stage 2 (440whp/540wtq)  includes rear o2 code out. It is designed to work on a vehicle with a full exhaust with stock fueling and turbos. E85 tuning option is not available for this product. Upgraded intercoolers recommended. Upgraded torque convertor recommended.

• Stage 3  (470-700+whp/550-700+wtq) is designed to work on a vehicle with a full exhaust, upgraded diverter valves, Hybrid turbos, Gt30, Gt35, 550cc, 750cc, or 1000cc injectors, and upgraded fuel pump(s). E85 tuning is available for this product. Upgraded engine/transmission internals may be required, please ask for details. Flash Loader Required (Included in Price)

Flash Loader

The flash loader is the most effective tool for flashing your factory ECU thru the OBDII port. It will enable you to flash your car’s ECU with performance software in just minutes. The flash loader can be connected to your PC with the included cables. It allows you to read and flash the factory ECU. The flash loader holds up to 10 tuned files, and 1 stock file.  

If your ECU is not stock, you may need to send it in for recovery back to stock form.

Additional information