MAD BMW G8x S58 3.5" Fat Boy Downpipes M3 M4 crank hub 4-ply silicone couplers as well

4-ply silicone couplers as well as stainless steel t-bolt clamps

These polyurethane bushings inserts are for the Revshift E9x/E8x motor mounts

This kit can be made shorter but this design is best for best overall MAF performance

Flex-Fuel Feature - The ability to adjust the Engine Computer parameters on the fly

competitors use walbro 267 which have a pressure relief 20% weaker than the 274

MAD BMW G8x S58 3.5" Fat Boy Downpipes M3 M4 crank hub 4-ply silicone couplers as wellOUT OF STOCK May 2nd 2023 The 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