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Dinan 304 stainless steel axleback exhaust with quad 4.5 inch black ceramic coated tips and integrated valves
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Dinan Freeflow Axleback Exhaust System with 4.5in Black Tips for 2020-2025 BMW X3 M / X4 M (D660-0086-BLK)

$2,699.95 $3,037.95
-11%
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Dinan Freeflow Axleback Exhaust System with 4.5in Black Tips for 2020-2025 BMW X3 M / X4 M (D660-0086-BLK)
$2,699.95 $3,037.95
$2,699.95 $3,037.95

Fits select 2020-2025 BMW X3 M and X4 M models (including Competition variants).

The Dinan Freeflow Axleback Exhaust System provides a deeper, sportier exhaust note while enhancing the aggressive aesthetics of the BMW X3 M and X4 M. Constructed from 100% 304 brushed stainless steel with precision TIG welding, this system replaces the restrictive factory muffler. It features quad 4.5-inch (114mm) black ceramic-coated, double-walled tips with an inverted clamp design that hides hardware for a clean, "Tuck-it" appearance. The system utilizes 76mm piping (up from the 70mm OE diameter) and incorporates massive 76mm computer-controlled valves to minimize backpressure while maintaining civil low-speed operation.

  • Direct bolt-on installation with included mounting hardware
  • Power gains: +8 HP and +6 FT-LB @ 6600 RPM
  • Weight reduction: 5 lbs lighter than the factory system
  • 76mm twin exhaust valves are 30% less restrictive than OE
  • Signature straight-cut tip design with laser-engraved Dinan logo
  • Retains factory computer-controlled exhaust valve functionality
  • Larger diameter 76mm piping for increased flow
  • Manufacturer Part Number: D660-0086-BLK
📘 Guides & Manuals
🔧 Fitment & Compatibility
Year Make Model Submodel
2020-2024 BMW X3 M
2020-2022 BMW X3 M Competition
2020-2025 BMW X4 M
2020-2022 BMW X4 M Competition

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