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I passed RI inspection with catless + MHD
Car will run fine with downpipes & no tune, the downpipes are actually great for the longevity of the turbos. Regarding the rough idle, the likely culprit would be carbon buildup. How many miles are on the car?
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2011 E92 335is, Space Grey/Coral Red, 6MT.
RB 2+, Wedge tuned. E85 PI coming soon.
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