5 FANTASTIC BMW 135I N54 DOWNPIPES
Your search for the best BMW N54 downpipes ends here. However, BMW 135i is a fantastic and easy car for daily use; its significant restrictions are the factory-catted downpipes. Since bolting it directly to the turbochargers, there is slowing of the turbo spool because of the considerable back pressure created by the factory catalytic converters. Though removing them could be the best option, it may cause more emissions. Hence, the best alternative is fixing the BMW 135i N54 downpipes for enormous power gains, aggressive exhaust notes, and fast spool.
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