I thought that I would save some money and improve the ignition in my M5 so I purchased 10 performance coil packs,WHAT A MISTAKE. Started the car 1,4,6 9 cylinders misfired went into limp mode . Cleared the codes restarted same thing happened but different cylinders. I went on the internet and found other people had problems with these coil packs. Found out who made the original coil packs it was BREMI ordered 10 BREMI COILS ,they came I installed , CAR HAS NEVER RUN BETTER . I highly recommend these coil packs, I wasted all that time doing the job twice.