MAD BMW S58 3.5" Fat Boy Downpipes M2 M3 M4 G87 G80 G82 G83 Convertible shaving off even more unsprung

shaving off even more unsprung weight without compromising strength

Superior Quality: Constructed with top-tier materials for increased durability and long service life

Cloud based solution with a web based interface for use with a laptop or with our mobile apps built for iOS and Android

Direct Fit: Designed with a specific focus on the Toyota Supra B58 A90

MAD BMW S58 3.5" Fat Boy Downpipes M2 M3 M4 G87 G80 G82 G83 Convertible shaving off even more unsprungThe MAD 3. 5" S58 Fat boy is the largest BMW S58 catless downpipe on the market! Upgrade from the stock S58 downpipes to the MAD 3. 5" Fat Boy S58 catless downpipes for maximum airflow, power, and sound! Upgrade to the MAD BMW 3. 5" Fat Boy S58 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 bonus, your car will sound a