Spark Plug Upgrade... When?

02-10-2022, 01:00 PM	#1
MOBF10 Captain 171 Rep 617 Posts Drives: 2018 M3 Comp Join Date: May 2018 Location: Socal iTrader: (1)	Spark Plug Upgrade... When? So I'll be upgrading to stage 2+ with MHD Tuning pretty soon and was wondering for those of you running 2+ if you've upgraded the spark plugs on your cars or just running stock plugs still? My Stage 2+ on my 535i n55 was running stage 1 colder plugs and was only in the 300whp+ range still. These b58's are running close to 500whp on stage 2+. Any input?
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