Diffuser Installation GuideUpdated a month ago
Tools Required
Trim removal tools or flathead screwdriver (plastic preferred to avoid scratches)
Socket wrench set
Cleaning supplies (microfiber towel, isopropyl alcohol)
(Optional) Jack and jack stands for better access
1️. Preparation
Park on a flat surface.
(Optional) Jack up the rear for easier access.
Clean the rear bumper and surrounding area.
Make sure the exhaust tips are cool before starting.
2️. Remove the OEM Diffuser
For most BMW models:
Locate the screws and clips, look underneath the rear bumper, you'll usually find 6–8 screws or push clips holding the diffuser.
Remove fasteners and use a socket wrench or screwdriver to remove them.
Use trim tools and gently pry the diffuser away from the bumper starting at one corner. It will have plastic clips that snap into the bumper — be patient and avoid cracking them.
🔧 Tip: If you have an M Sport bumper, removal may require a bit more force since those diffusers sit tighter.
3️. Test Fit the Carbon Fiber Diffuser
Hold it in place to make sure all tabs and holes align.
Some diffusers may require minor trimming for a perfect fitment.
4️. Install the New Diffuser
Line up the tabs and snap it in place, starting from one end and working your way across.
Reinstall all screws or clips you removed earlier (or use the hardware provided).
Ensure everything is flush with the bumper and centered properly.
5️. Clean and Inspect
Wipe off any fingerprints or smudges from the carbon fiber.
Check that the diffuser doesn’t rub against the exhaust tips.
✅ Installation Complete!
You're now ready to enjoy your upgraded BMW.