Quote:
Originally Posted by GDBimmer
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.
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Hey, I have a 2021 as well and was thinking of doing something with the exhaust. Is the DP worth it and does it make it significantly louder?
Also do you have droning in comfort vs sport? Any pops/burbles?