Dinan’s Free Flow exhaust system features 100% stainless steel construction measured to exact specifications to ensure proper fit via factory hangers and mounting points. Dyno tuned for maximum exhaust flow with minimum backpressure, this system is designed to provide a more aggressive sound under acceleration, while reducing drone inside the vehicle, thanks to computer controlled valves that limit noise during low speed driving and open fully during high-load conditions to allow free flow. The exhaust gasses exit through larger laser engraved polished quad tips.

Benefits of the Free Flow Exhaust for the F8x M3/M4:

+ Maximum gain of +5 HP
+ Sportier sound
+ 100% 304 Stainless Steel Construction
+ Quad 3.5" laser engraved polished tips with Dinan logo
+ Computer controlled valve limits noise during low speed driving; valve opens fully during high-load conditions to allow free flow
+ Stock exhaust valve actuaters are reused
+ Operation of exhaust valve is unchanged so exhaust tone can be adjusted via the M-Drive settings. 
+ Dinan exhaust is 3 lbs lighter than stock
+ Twin secondary exhaust valves with a whopping 76mm diameter, making them 45% less restrictive than the OE valves.
+ Includes mounting hardware

Models supported by Free Flow Exhaust for the F8x M3/M4

• 2015-2018 M3 F80 Sedan 
• 2015-2018 M4 F83 Convertible 
• 2015-2018 M4 F82 Coupe 

DOWNLOAD INSTALLATION INSTRUCTION HERE