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our 3″ race downpipe feature a full 3″ design up to the last couple of inches of the pipe which allows an increase of flow
Although firmware updates are a very rare occurrence since REV2 contains no state or tuning data
The ARM N63R M550i downpipes utilize two O2 sensor bungs on each downpipe to allow for reinstalling the O2 sensors in their factory locations
Stock air filters are replaced with 77% larger Dinan conical air filters for optimum flow
N55 pneumatic wastegate (PWG):
MAD BMW S55 3.5" Fat Boy Downpipes M2C M3 M4 W/ Flex Section Silver Ceramic Coated?:Yes our 3″ race downpipe featureWe are proud to introduce the MAD S55 Fat Boy 3. 5" Downpipes. These are the largest BMW S55 M2 M3 M4 downpipes on the market. Upgrade from the stock S55 downpipes to the MAD 3. 5" S55 catless downpipes for maximum airflow, power, and sound! Upgrade to the MAD BMW 3. 5" S55 downpipes to eliminate the backpressure caused by your stock catalytic converters. By upgrading to our downpipes, your turbos can now spool faster and achieve maximum power. As a
