Also notice that some tuners have engine conversions. The cost of the whole set of S62(M5) engine with all wiring and accessories is more than $20k. Hartge and Racing Dynamics have the engine conversion ready. Hartge engine costs about $15000 and makes 350 HP. Racing Dynamics engine has a more aggressive set up and producing about 408HP. The cost of the engine conversion is about $15200 for Racing Dynamics.