“BMW 435i (2012+) Stage 1 Performance ECU Tune (N55)” has been added to your cart. View cart $949.00 Audi S3 2013+ Performance ECU Tune Want to add even more Horsepower? Upgrade to Stage 2 ECU Tune. (Catless Application) Adds an approx. 30-40 additional Horsepower! Check the box below: Upgrade to Stage 2 + $399.00 Product price $949.00 Additional options total: $0.00 Order total: $949.00 Audi S3 2013+ Performance ECU Tune quantity — OR — Add to cart Category: Audi S3 Tags: audi, Dyno, ecu tune, s3, stage 1, stage 2, tune Description Additional information Description +70 Horsepower +100 Torque Performance ECU Tune for the Audi S3 Eliminate Top Speed Limiter Increased Throttle Response Optimized Fuel and Spark Optimized for 93 Octane Additional information Stage 2 Stage 2 Related products BMW 550i (2006-2010) Stage 1 Performance ECU Tune $1,099.00 Select Options BMW M5 F10/F13 (2012-2016) Stage 1 Performance ECU Tune $2,499.00 Select Options BMW 135i Stage 1 Performance ECU Tune (N54) $599.00 Select Options BMW 328i E90/E92 Stage 1 Performance ECU Tune (N52) $499.00 Select Options