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I don't own a 1M, but am running catless Dp's, N55 mids and a Berk tech. Street Exhaust. Power gains were noticable and did not have the "gas smell" whatsoever. One thing I did do was install the BMS o2 Sims to avoid the codes related to the catless downpipes.
My maintenance is done by an "independent" shop here in Germany so I really don't worry on code issues. I also have a BT tool so I can scan and see if I have any issues.
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Quote from Ezeedee regarding car mods:
"you're only done when you sell the car  " |