2008 - 2009 Mercedes Benz C63 - W204 (M 156 engine) ECU Upgrade by MKB Tuning - This package offers more bang for your buck in performance & quality (TUV CERT.) then any other Mercedes tuner. Other tuning companies can only get gains this high from and ECU and manifold package. This means more labour costs & more intrution on your motor. Increase in performance to 383 kW (521 HP) at 6800 rpm, 645 Nm at 5100 rpm - modification: Modified engine management with readapt ignition map and injection map, incl.Vmax delimiter. ***This product requires you to remove and send your ECU to www.grillesandmore.com for programing. Complete turn around takes about 3-4 days. grillesandmore.com would suggest having all labour done by a qualified technician.