BMW X4 M40i Performance Exhaust - Dinan - Freeflow Axleback - Black - `19-`25
BMW X4 M40i Performance Exhaust - Dinan - Freeflow Axleback - Black - `19-`25
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BMW X4 M40i Performance Exhaust – Dinan Freeflow Axleback – Black (2019–2025). A premium, valved axle-back that delivers a richer, sportier soundtrack while preserving everyday refinement.
Dinan replaces the stock single-to-dual layout with an enlarged, straight 83 mm path feeding a Helmholtz-tuned muffler that trims drone and deepens tone. Factory valve control remains for quiet cruising or full voice under throttle. Built from 100% T304 stainless and TIG-welded, it installs as a direct bolt-on using factory points. Quad 3.75 in black ceramic, laser-engraved tips complete the rear, and the design sheds about 7 lb versus stock.
Features
- Factory valve functionality retained
- Helmholtz tuning reduces cabin resonance
- Enlarged 83 mm path; resonator/collector removed
- Quad 3.75 in black ceramic, laser-engraved tips
- 100% T304 stainless, TIG-welded; direct bolt-on install
Questions or planning an install? Call our teams in Austin, TX or the Los Angeles, CA area; we offer installation and customization at both locations: 512-982-9393 (TX), 562-981-6800 (CA).
Buying multiple items? Contact us for potential shipping discounts. We install on premises at both locations.
CA Residents: 
WARNING: Cancer and Reproductive Harm - www.P65Warnings.ca.gov
Need Assistance?
We're here to help!
Call us at 512-982-9393 (Austin, TX) or
562-981-6800 (Signal Hill, CA)
and get assistance from one of our sales team members!
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