$999.00 Note: Stage 2 is available and is for a catless application BMW 428i Stage 1 Performance ECU Tune (N20) 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 Additional options total: Order total: BMW 428i Stage 1 Performance ECU Tune (N20) quantity — OR — Add to cart Category: BMW 428i Tags: 428i, bmw, Dyno, ecu tune, n20, stage 1, stage 2, tune Description Description +80 Horsepower +65 Torque Performance ECU Tune Features Eliminate Top Speed Limiter Increased Throttle Response Optimized Fuel and Spark Optimized for 93 Octane Related products BMW M3 F80/F82 (2015-2016) Stage 1 Performance ECU Tune $1,099.00 Select Options BMW 328i E90/E92 Stage 1 Performance ECU Tune (N52) $499.00 Select Options BMW 550i (2006-2010) Stage 1 Performance ECU Tune $1,099.00 Select Options BMW 535i (2008-2010) Stage 1 Performance ECU Tune (N54) $999.00 Select Options