Dinan Free Flow Axleback Exhaust - Black Tips - BMW F80 M3 / F82 M4

Dinan's S55 Free Flow Axleback preserves the factory M-Drive exhaust valve integration while upgrading the secondary valve hardware to 76mm — 45% less restrictive than OEM. The computer-controlled valves retain their stock operation logic, so M Sport exhaust mode still works exactly as it did from the factory; the difference is that when the valves open under high load, they open into a genuinely less restrictive system. 100% stainless steel, factory bracket and hanger fitment, drone abatement engineering at cruise, and quad 3.5" black ceramic laser-engraved tips. Fitment: F80 M3 / F82 M4 / F83 M4 Convertible.

Features:

+ Twin 76mm secondary valves — 45% less restrictive than OEM exhaust valves
+ Retains factory M-Drive exhaust valve operation — no reprogramming required
+ Quad 3.5" black ceramic laser-engraved exhaust tips
+ Drone abatement engineering — factory-quiet at cruise, aggressive under load
+ 100% stainless steel, factory bracket/hanger fitment — BMW F80 M3 / F82/F83 M4