07/05/2026
A legendary C7 RS6 in for Unitronic Stage 2 ECU software and Redstar downpipes.
Baseline with downpipes fitted on the stock ECU:
307kw & 581nm
After Unitronic Stage 2 calibration:
349kw & 668nm
A huge increase in power and response while keeping the RS6 refinement intact 🔥