Mercedes-Benz M278 4.7L Bi-Turbo XperTune Performance Software V8 Vantage and cam phasing parameters are

and cam phasing parameters are all optimized to extract maximum driveability

removal of the speed limiter and raised rpm resulting in increased in power and most importantly smooth and quick acceleration with no flat spots or hesitation all within a few hours

Any and all other brands of catalytic converters simply and quickly degrade

TQ (ft/lbs): +54

Mercedes-Benz M278 4.7L Bi-Turbo XperTune Performance Software V8 Vantage and cam phasing parameters arePerformance ECU software upgrade improves horsepower, torque, and driving characteristics of the M278 4. 7L V8 BiTurbo Engine by reprogramming various sensor inputs, air fuel ratios, and boost pressure. FEATURES: Fits all Mercedes Benz 550 M278 4. 7L V8 BiTurbo Vehicles: E Class S Class CL Class CLS Class SL Class M Class GLE Class GL Class GLS Class Stock Varies by Model Tuned +100 HP +110 ft lbs of torque Fabspeed Motorsport saves your stock factory