Originally Posted by ErvGotti
It's not plug and play though with the N54 and I'm sure it would be the same for the N55. There are threads on E90 post where people found the proper gap to run them on the N54, but I haven't seen anything for the N55. I'm sure someone could get them to work on the N55 you'd just have to be willing to experiment a bit with the gap.
The required gap correlated to the power your running. If you running stock turbo's then a stock type gap should work. I think the N54's were lowering gap from .028 to .022 which again is only needed at higher boost levels with upgraded turbo's when you start to misfire.
2008 135i - Cobb AP, MS DP's, Berk street exhaust, AMS IC, BMS DCI, CDV delete, Quaife LSD, M3 control arms, M3 rear SF bushings, SS brake lines.