View cart “BMW 235i (2012+) Stage 1 Performance ECU Tune (N55)” has been added to your cart. $1,699.00 House of Power Stage 1 Mercedes S550 2012+ ECU Tuning 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: Mercedes S550 2012+ Stage 1 Performance ECU Tune (M278) quantity — OR — Add to cart Category: S550 Tags: benz, Dyno, ecu tune, m278, mercedes, s550, stage 1, stage 2, tune Description Description +185 Horsepower +260 Torque Performance ECU Tune for the Mercedes S550 M278 Engine (2012+) Eliminate Top Speed Limiter Increased Throttle Response Optimized Fuel and Spark Optimized for 93 Octane Related products BMW M3 E90/E92 (2008-2013) Stage 1 Performance ECU Tune (S65) $799.00 Select Options BMW 135i Stage 1+2 Performance ECU Tune (N55) $799.00 Select Options BMW 535d (2007-2008) Stage 1 Performance ECU Tune (N57) $1,099.00 Select Options BMW 135i Stage 1 Performance ECU Tune (N54) $599.00 Select Options