Dinan Free Flow Axle-Back Exhaust - 1997-2003 BMW 525i/528i/530i

Stainless Steel - Polished Tip - w/ M-Technic Bumper - E39

Part # D660-3948 Be the first to write a review
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Dinan's Free Flow Axle-Back Exhaust for the 525i, 528i, and 530i equipped with the M-Technic bumper provides increased flow for 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 which provides the optimum balance between maximum power gains and a civilized, yet sporty exhaust note. The Dinan exhaust also provides substantial weight reduction compared to the stock muffler, weighing in at 18.5 lbs. compared to the stock system at 23.5 lbs. Single oval polished stainless steel exhaust tip gives the cars a tasteful performance look as well.


  • More Power: + 5 HP @ 6500 RPM + 4 LB-FT @ 6500 RPM (w/ software)
  • Drone abatement technologies used to reduce cabin resonance
  • Enjoyably louder, sportier sound
  • Single polished oval and laser engraved exhaust tip
  • 5 lbs. lighter than stock (18.5 lbs. vs. 23.5 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)1.5
Max HP Gain5 @ 6500 RPM
Max Torque (lb-ft) Gain4 @ 6500 RPM
Product TypeAxle-Back Exhaust
Part NumberD660-3948

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.

Not compatible with the wagon.

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