Dinan Free Flow Axle-Back Exhaust - 2000-2003 BMW M5

Stainless Steel - Polished Tips - E39

Part # D660-3950 Be the first to write a review
Estimated shipping date: 12/23/2021
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Dinan's Free Flow Axle-Back Exhaust for the M5 provides improved flow and the resulting power gains without the excessive noise associated with typical aftermarket mufflers. The Dinan exhaust features a rigid and durable muffler case, manufactured from 20 gauge-304 stainless steel for optimum resistance to corrosion. Internally, the systems feature Dinan's Tuned Resonance Chamber Technology, providing the optimum balance between maximum power gains and a civilized, yet sporty exhaust note. The system also reduces weight substantially, weighing in at only 37.6 lbs. as compared to the stock system at 66 lbs. Dual 3-inch diameter polished stainless tips give the cars a tasteful performance look as well.


  • More Power: + 6 HP @ 6500 RPM + 5 LB-FT @ 6500 RPM (w/ software)
  • Drone abatement technologies used to reduce cabin resonance
  • Enjoyably louder, sportier sound
  • Dual 3" polished and laser engraved exhaust tips
  • Over 28 lbs. lighter than stock (37.6 lbs. vs. 34 lbs.)
  • 100% 304 stainless steel construction
  • Uses the factory brackets and hangers for a factory-like fitment
Brand Dinan
Dinan Point Value3
Emission Code5
Labor Time (Hours)2
Max HP Gain6 @ 6500 RPM
Max Torque (lb-ft) Gain5 @ 6500 RPM
Peak HP402 @ 6500 RPM
Peak Torque (lb-ft)375 lb/ft @ 4500 RPM
Product TypeAxle-Back Exhaust
Part NumberD660-3950

This part is legal for sale or use on Emissions Controlled Vehicles, Uncontrolled (Non-Emissions Controlled) Vehicles, and Racing Use Only Vehicles because it does not affect vehicle emissions and is not covered by emissions regulations.


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