Description
The Dinan cat-back exhaust changes the sound and rear appearance of 2019-2025 BMW X4 M40i. This version supplies black-finished exhaust tips.
A tuned Helmholtz chamber addresses resonance in the lower engine-speed range while the freer-flowing muffler arrangement gives the exhaust a stronger voice. Sound remains dependent on load, transmission behavior and the other exhaust sections.
Technical details
- Acoustic design: Helmholtz resonance-control chamber.
- Construction: 304 stainless steel.
- Tip finish: black.
- Listed vehicle application: 2019-2025 BMW X4 M40i.
- Manufacturer part number: D660-0099-BLK.
Fitment and installation
- Confirm body style, drivetrain and the original rear-valance configuration. Review the installation procedure for cutting, joining and valve-transfer requirements.
- A stronger exhaust note does not mean zero cabin resonance; other modifications can change the sound substantially.