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Had a friend with a cpe downpipe/exhaust combo (I believe it was, or it was the oem exhaust) and he return to stock because of the drone and loudness.
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2011 135i M Sport 6MT
Berks Race Exhaust|PLM Catless DP|ETS CP|BMS Intake|JB4 ISO|Flex Fuel|BMW LCI Blackline Taillights|Rieger 1m bumper|Rieger Diffuser|Apex ARC-8
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