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

Stainless Steel - Polished Tips - w/ Standard Bumper - E39

PART# D660-3940

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$723.00   Suggested Retail
$649.95   Your Price
Estimated shipping date: 11/05/2020
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Dinan's Free Flow Axle-Back Exhaust for the 540i provides power gains without the excessive noise associated with typical ''performance'' mufflers. The Dinan exhausts feature rigid and durable muffler cases manufactured from 20 gauge 304 stainless steel for optimum corrosion resistance. 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 Dinan exhausts also provide substantial weight reduction compared to the stock mufflers. The mufflers weigh in at 18.5 lbs. compared to the stock systems at 34 lbs. Dual 3-inch diameter polished stainless steel exhaust tips give the cars a tasteful performance look as well.


  • More Power: + 7 HP @ 6500 RPM + 6 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 15 lbs. lighter than stock (18.5 lbs. vs. 34 lbs.)
  • 100% 304 stainless steel construction
  • Uses the factory brackets and hangers for a factory-like fitment


Dinan Point Value3
Emission Code5
Labor Time (Hours)1.5
Max HP Gain7 @ 6500 RPM
Max Torque (lb-ft) Gain6 @ 6500 RPM
Product TypeAxle-Back Exhaust
Part NumberD660-3940



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.

Tech Resources

Not compatible with vehicles equipped with the rear M-Technic bumper.



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