Quote:
Originally Posted by r33_RGSport
Yes, but you can always supress it with some piggy back tune or O2 sensor extension.
I got that taken care on my 528 and X5. I have heard on the N63tu is just by O2 extender.
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Are you located in ny? I'm interested doing this to my GC but, I don't trust the shops by me they do horrible jobs. Can you post a vid of your 528 and X5 exhaust note with a few revs?