Hey guys, I'm pretty new here and I don't know why I haven't made an account earlier but here goes. My 212 E220 BlueTEC feels great to drive (and punch) around town, however I'm frequently on the motorway for extended periods of time, so it tends to feel quite lethargic if i floor it to 80MPH or slightly higher My question is, since the E220 and E250 have the same 651.924 engines, could I not just get an E250's ECU and replace my current one along with a new key+ignition barrel? Or is it smarter than that? I could also probably just get it remapped, Celtic Tuning are claiming they can get this up to 215bhp from 174 and 363lb/ft of torque from 295. Does anyone have any experience with Celtic?