Dinan Free Flow Axle-Back Exhaust for BMW | E46 | M3 | D660-4604

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Part# D660-4604

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The Dinan sport muffler is designed to compliment the E46 M3 and not overpower the driver and passengers with harsh tones. Dinan engineers their exhausts to sound great and be a natural fit to the character of the car as well as produce more power and torque. Dual 3.5" stainless satin black tips engraved with the Dinan logo fill out the rear valence. Annoying highway drone has also been engineered out of the system. Dinan uses only 304 stainless steel in their systems for the maximum corrosion protection. This system replaces the factory rear mufflers at a pre-determined cut point on the stock exhaust, which makes for an easy installation and you can reinstall your original mufflers using factory hardware. Detailed installation instructions are included.

Note: only the passenger-side tips are functional (exhaust exits from the two right side tips only). The driver's side tips are only for aesthetics. Dinan has engineered it this way to minimize drone.


  • +7 HP @ 7000 RPM - +5 lb/ft @ 5000 RPM
  • Durable 20-gauge 304 Stainless Steel Muffler
  • Ceramic coated tips
  • Weight savings over the stock muffler
  • Uses Dinan's Tuned Resonance Chamber Technology

Installation Instructions: Dinan E46 M3 Axle-Back Exhaust D660-4604 Instructions


  • E46 BMW M3 S54


⚠️CALIFORNIA WARNING: Cancer and Reproductive Harm - www.P65Warnings.ca.gov

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