APR Stage 2 ECU Upgrade and Downpipes Dual Release for S6, S7, RS6, RS7, S8!

DUAL RELEASE! SOFTWARE & DOWNPIPES.APR Stage II CalibrationSoftware Application GuideAudi S6 (C7 & C7.5)Audi S7 (C7 & C7.5)Audi RS6 (C7 & C7.5)Audi RS7 (C7 & C7.5) Audi S8 (D4)APR Cast Downpipe Exhaust System for the 4.0 TFSIThe APR Cast Downpipe Exhaust System replaces the restrictive factory catalyst cross pipes and resonators with an upgraded 76mm stainless steel mandrel-bent system, […]