proTUNING Freaks I'm about to pull the trigger on your tune but was wondering about this article on your site...
BMW F series (N55 / S55 / S63TU) Spark Plugs - What brand and which gap?
Should I replace the stock spark plugs with the NGK 97506 plugs in my S55 if I'm just planning on running a Stage 1 OTS or the OEM CS tune? Thanks!