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NGK reccomends that anytime you add 70 to 100hp you should go one step colder on your heat range. I'm currently FBO on my stage 2+ M235i and i run the NGK SILZKBR8 plugs found in the S55. They are one step colder. Depending on how high you're going with boost( Say you get a custom tune) I would say go two steps colder. The N26 engine plugs.
depending on how many Miles are on your plugs i would change them. I had 50,xxxKM on my stock plugs and they were fine. Switched them out for just recently to those NGK, Probably go 2 steps next change.
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16 M235xi 8ZF Black on Red FBO: Xhp trans tune -BMS Intake - VRSF Catless DownPipe - VRSF CP - VRSF Muffler delete/resonator - n22 plugs - MHD stage 2+ 95map - Wagner EVO II Preformace IC - Rear seat delete - weight reduction/stripping -FTP 18.5in rims - Hawk HPS front pads - StopTech STR 660 fluid  |