Dinan Free Flow Axle-Back Exhaust - 1997-2003 BMW 540i | D660-3940

The Dinan Free Flow Axle-Back Exhaust (D660-3940) is a performance-engineered solution for the 1997-2003 BMW 540i, designed to provide measurable power gains without the excessive noise associated with typical "performance" mufflers. The system is built for durability, featuring rigid muffler cases manufactured from 20 gauge 304 stainless steel for optimum corrosion resistance.

Internally, the exhaust utilizes Dinan's Tuned Resonance Chamber Technology and drone abatement to provide the optimum balance between maximum power gains and a civilized, yet sporty exhaust note. The system provides a verified gain of +7 HP and +6 LB-FT of torque at 6500 RPM (when used with software) and is substantially lighter than the stock muffler, achieving an over 15 lbs. weight reduction (system weight is 18.5 lbs. vs. 34 lbs. stock).

Features:

• Verifiable Power Gains: Delivers an increase of +7 HP and +6 LB-FT of torque at 6500 RPM (with software).

• Acoustic Precision: Utilizes Tuned Resonance Chamber Technology and drone abatement to provide a sporty sound while reducing cabin resonance.

• Superior Material & Construction: Built from 100% 304 stainless steel construction (20 gauge) for optimum corrosion resistance.

• Optimized Weight: Provides an over 15 lbs. weight reduction (18.5 lbs. vs. 34 lbs. stock).

• Aesthetic Excellence: Finishes with dual 3-inch polished stainless steel exhaust tips for a tasteful performance look.

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

Product Contains:

• (1) Dinan Free Flow Axle-Back Muffler Assembly

• (2) Dual 3" Polished Stainless Exhaust Tips

• (1) Complete Installation Hardware Kit

Important Note: This product is Not compatible with vehicles equipped with the rear M-Technic bumper.

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

Installation Instructions