Dinan Free Flow Axle-Back Exhaust - 2011-2016 BMW 550i | D660-0036-BLK

The Dinan Free Flow Axle-Back Exhaust (D660-0036-BLK) is a premium, performance-engineered system for the 2011-2016 BMW 550i. This exhaust improves exhaust flow by reducing back pressure, resulting in increased power output and a great sporty sound that is civilized when you want it to be and pleasantly aggressive under hard acceleration with zero drone. The system delivers a verified power increase of +10 HP when coupled with engine software.

Dinan ensures noise control through a vacuum controlled butterfly valve that is utilized to improve flow at wide-open throttle while keeping things civilized and "drone" free throughout. Constructed from 100% 304 stainless steel and built to exacting specifications, the system ensures a correct fit using the factory hangers and resists corrosion for years to come.

Features:

• Verifiable Power Gains: Delivers an increase of +10 HP when coupled with engine software.

• Acoustic Precision: Utilizes a vacuum controlled butterfly valve and drone abatement technologies to eliminate cabin resonance and provide a sporty sound.

• Superior Material & Construction: Built from 100% 304 stainless steel construction to resist corrosion for years to come.

• Aesthetic Excellence: Finishes with quad 3.5" ceramic black exhaust tips (polished tips also available) for a tasteful high-performance look.

• Flow Optimization: The butterfly valve improves flow at wide-open throttle while the "zero drone" design maintains interior civility.

• Fitment Integrity: Uses the factory brackets and hangers for a guaranteed, factory-like fitment.

Product Contains:

• (1) Dinan Axle-Back Muffler Assembly

• (4) Quad 3.5" Black Ceramic Coated Exhaust Tips

• (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