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Only use this function for racing purposes
With this direct fit upgrade
simply power on the Bavsound Portable Air Pump
such as track days or off-road excursions
MAD N20 4" Downpipe W/ Bracket BMW 228 328 428 528 BMW-E90 318d-2007 Only use this function forUpgrade from the stock N20 downpipe to the MAD N20 4" catless downpipe for maximum airflow, power, and sound! Upgrade to the MAD BMW N20 4" downpipe to eliminate the backpressure caused by your stock catalytic converters. By upgrading to our downpipe, your turbo can now spool faster and achieve maximum power. As a bonus, your car will sound a lot nicer as well. Expect up to a 30HP increase on a tuned BMW N20with stock turbo, even more on cars with
