Overview

The F8x M3/M4's are an audible treat right off the showroom. Coupled with a Dinan exhaust however they become a symphony of aural delight that even the most discerning ear will find pleasing. Dinan's Free Flow axle-back 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, or ceramic black, quad tips. Every Dinan product comes with our industry-exclusive factory matching new car bumper to bumper warranty and is designed and tested in Morgan Hill, California and can be purchased and installed at any Dinan Approved BMW dealership nationwide.

Features: - More Power: +5 HP - Drone abatement technologies used to reduce cabin resonance - Enjoyably louder, sporter sound - Quad 3.5" black ceramic coated, or polished stainless, laser engraved exhaust tips - 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. - 100% 304 stainless steel construction - Uses the factory brackets and hangers for a factory-like fitment

Specifications – D660-0050

Body Material: T304 Stainless Steel Brand: Dinan Category: Exhaust Clamps Included: Yes Dinan Point Value: 3 Emission Code: 5 Exhaust Tip Quantity: 4 Finish: Brushed Grade Type: Performance Hangers Included: Yes Height: 12 Labor Time (Hours): 1.8 Length: 50 Material: T304 Stainless Steel Max HP Gain: 5 Muffler Quantity: N/A Pipe Material: T304 Stainless Steel Product Type: Axle-Back Exhaust Sub Category: Exhaust and Tail Pipes Tip Finish: Polished Weight: 56 Width: 34 UPC: 813725020679 Part Number: D660-0050

Specifications – D660-0050-BLK

Body Material: T304 Stainless Steel Brand: Dinan Category: Exhaust Clamps Included: Yes Dinan Point Value: 3 Emission Code: 5 Exhaust Tip Quantity: 4 Finish: Brushed Grade Type: Performance Hangers Included: Yes Height: 12 Labor Time (Hours): 1.8 Length: 50 Material: T304 Stainless Steel Max HP Gain: 5 Muffler Quantity: N/A Pipe Material: T304 Stainless Steel Product Type: Axle-Back Exhaust Sub Category: Exhaust and Tail Pipes Tip Finish: Black Ceramic Coated Weight: 56 Width: 34 UPC: 813725021874 Part Number: D660-0050-BLK