Dinan D660-0036-BLK - Freeflow Axle-Back Exhaust

Dinan D660-0036-BLK - Freeflow Axle-Back Exhaust

Dinan Free Flow Axle-Back Exhaust - 2011-2016 BMW 550i

Freeflow Axle-Back Exhaust; 304 Stainless Steel Construction; 10 Max Horsepower Gain; Four 3.5 in. Laser Engraved Black Tips;

Dinan's Free Flow Axle-Back 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 harder acceleration with zero drone. 100% stainless steel construction and exacting specifications ensure that the system fits correctly using the factory hangers and will resist corrosion for years to come. A vacuum controlled butterfly valve is utilized to improve flow at wide-open throttle while keeping things civilized and "drone" free throughout. The design reduces overall weight as well and features 3.5'' polished, or ceramic black, tips for a tasteful high-performance look.

• Improves Exhaust Flow By Reducing Back Pressure
• Increases Power Output And Provides Great Sporty Sound
• Construction Ensures That System Fits Correctly w/Factory Hangers
• Vacuum Controlled Butterfly Valve Is Utilized To Improve Flow
• The Valve Keeps Things Civilized And Drone Free Throughout
• Sportier Sound
• Bolt-On Installation
• Four 3.5 in. Stainless Steel Polished/Laser Engraved Exhaust Tips
• Adds 10 Horsepower When Used In Conjunction w/Software Upgrade