Dinan Free Flow Axle-Back Exhaust - 2018-2023 BMW M550i (G30) | D660-0075

The Dinan Free Flow Axle-Back Exhaust (D660-0075, D660-0075-BLK) ushers in a new era of Dinan exhaust design for the 2018-2023 BMW M550i (G30). Internally, the exhaust is engineered to improve flow by reducing back pressure, resulting in a verifiable power output increase of +8 HP and +6 LB-FT of torque at 6600 RPM.

The core of this system is the seamless integration with the factory's noise control: computer-controlled exhaust valves are retained, allowing the driver to limit noise during low-speed driving and open fully during high-load conditions for maximum flow. Dinan engineering ensures an intimate cabin experience with zero low-RPM drone. This refined aggression is visually complemented by the new styling of the tips, which are clamp-on and double-walled—a significant shift from previous designs.

Features:

• Verifiable Power Gains: Delivers an increase of +8 HP and +6 LB-FT of torque at 6600 RPM.

• Acoustic Duality: Retains computer-controlled exhaust valves to limit noise during low speed driving and provide a pleasantly aggressive sound under hard acceleration.

• Advanced Tip Design: Features four massive 4" diameter clamp-on, double-walled tips, available in either polished stainless or ceramic black finishes.

• Drone Abatement: Engineered to reduce low-RPM drone, ensuring the cabin remains intimate.

• Structural Quality: Built from 100% 304 stainless steel construction for maximum corrosion resistance.

• Installation: Easy bolt-on installation with included mounting hardware.

Product Contains:

• (1) Dinan Axle-Back Muffler Assembly

• (4) Quad 4" Clamp-On Exhaust Tips (Polished or Black Ceramic Coated)

• (1) Complete Installation Hardware Kit

Warranty This product is supported by a Manufacturer's Warranty. Note: Manufacturer warranty terms are subject to change.

Installation Instructions