Consistent, powerful spark delivery is vital when tuning the hot-V S63 engine for higher output. Prevent high-rpm misfires and spark blowout by refreshing your ignition system with Genuine BMW coil packs or heavy-duty Upgraded MMX Coil Packs designed specifically for elevated boost pressures. If you want a substantial, plug-and-play power increase without permanently altering your factory ECU software, install one of our RaceChip GTS5 Black Tuning Boxes, engineered to safely optimize sensor data for instant horsepower and torque gains.