Dinan Free Flow Axle-Back BMW M3/M4 F80/F82/F83 Polished - D660-0050
The Dinan D660-0050 Free Flow Axle-Back Exhaust is designed for 2015-2020 BMW M3/M4 applications using the F80/F82/F83 chassis.
The system uses 100% T304 stainless steel construction, factory brackets and hangers, and Dinan's twin 76mm secondary exhaust valves. Dinan lists up to 5 horsepower of gain and retains the factory exhaust-valve operation through the M-Drive settings.
The system is 3 pounds lighter than stock and is designed for factory-like fitment. Dinan lists it as emission code 5.

