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The flex pipe section is engineered to minimize stress and unwanted vibrations
The resonator tames the sound slightly
Instructions may also be similar for similar items such as trunk lips
(Aftermarket charge pipe may be required)
MAD BMW S58 3.5" Fat Boy Downpipes M2 M3 M4 G87 G80 G82 G83 Good Go M3 Bumper The flex pipe section isThe 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
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