Quote:
Originally Posted by P_Leotardo
Do you have to get a tune to operate with an aftermarket downpipe?
Will installing an aftermarket downpipe cause CEL?
Will installing an aftermarket downpipe catch flack from the dealer at service intervals?
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You don't need a tune to run an aftermarket DP, but if you go catless you will get a CEL (which can be removed when you get your car tuned.)
I'm running the AA catted DP in my JB4 '21 M340 with no issues. I get my car serviced at a local euro shop, so I can't speak with certainty for the dealer experience, but I would assume the worst-case situation is them making a note of it in your car's file.