MAD BMW S58 3.5" Fat Boy Downpipes M2 M3 M4 G87 G80 G82 G83 g2x Our intercoolers allow for higher

Our intercoolers allow for higher HP gains

Install takes 5 minute

thanks to integrated hook-and-loop fasteners that ensure a secure fit in seconds—no tools required

Recommended for the Dragy GPS Based Performance Meter

Upgrade your weak plastic S58 oil filter housing cap

MAD BMW S58 3.5" Fat Boy Downpipes M2 M3 M4 G87 G80 G82 G83 g2x Our intercoolers allow for higherThe 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