the guy who had my car before me actually had the walnut blast done before i bought it. Im too lazy to swap coils (lol) but I'm pretty sure thats it... if not, it'll just be bad plugs (but i doubt it after 20k, but you never know.) either way, i'd rather BMW pay for it since I have it covered. Thanks for the advice!
2007 JB e90 retired!
2008 BMS e90 stock for now