3″ Exhaust Decat Downpipes – BMW 3 / 4 Series F80 M3 / F82 M4 14-18

Made from polished T304 grade stainless steel Free flowing catalyst replacements to get the most from the twin turbo S55 engine Designed to replace the first pair of restrictive catalytic converters Mandrel bent and fully tig welded for strength and durability Sold for off road and track use only