$1,799.00 House of Power Stage 1 Mercedes CLS550 2011+ 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 CLS550 AMG 2011+ Stage 1 Performance ECU Tune (M278) quantity — OR — Add to cart Category: CLS550 Tags: benz, cls550, Dyno, ecu tune, m278, mercedes, stage 1, stage 2, tune Description Description +180 Horsepower +160 Torque Performance ECU Tune for the Mercedes CLS550 M278 Engine (2011+) Eliminate Top Speed Limiter Increased Throttle Response Optimized Fuel and Spark Optimized for 93 Octane Related products BMW 435i (2012+) Stage 1 Performance ECU Tune (N55) $999.00 Select Options BMW 535i (2011-2016) Stage 1 Performance ECU Tune (N55) $999.00 Select Options BMW M5 E6x (2006-2011) Stage 1 Performance ECU Tune $599.00 Select Options BMW 535i (2008-2010) Stage 1 Performance ECU Tune (N54) $999.00 Select Options