Dinan - Free Flow Stainless Exhaust System - BMW F8X M3/M4

For those wanting a more aggressive exhaust option, Dinan now offers the Free Flow Stainless Exhaust System. Dyno tuned for maximum exhaust flow with minimum backpressure, this exhaust 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. Features: - 100% 304 Stainless Steel Construction - Quad 3.5" Laser Engraved Polished (or Black) Tips w/ DINAN logo - Maximum gain of +5 HP - Sportier Sound - Resonated or high flow catalyst options - 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 System 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: 2015+ BMW F8X M3 & M4