Confirm Fitment
Hold the diffuser up to the rear bumper underside to confirm it aligns correctly. Check that the mounting points, clips, or bolt holes line up with the factory positions and that the diffuser sits flush with the bumper line.
Remove the Original Diffuser
Locate the factory fixing points — these are typically plastic push-clips, trim clips, or small bolts/screws along the bumper underside and edges. Release each one carefully using a trim removal tool or flathead screwdriver wrapped in tape to avoid scratching.
Clean the Mounting Area
Once the original diffuser is removed, clean the bumper underside and any exposed mounting surfaces with isopropyl alcohol (IPA) and a lint-free cloth. Remove any old adhesive residue, dirt, or grease from the clip housings.
Fit the New Diffuser
Align the new diffuser with the mounting positions. If factory clips are being reused, ensure they are transferred to the new diffuser first. Offer the part up and press each clip location firmly until you feel or hear it click into place.
Check All Clips Are Fully Seated
Go along the full length of the diffuser and press each clip point firmly. A properly seated clip will not flex or move when pressed. Check the diffuser is flush at all edges with no gaps between it and the bumper.
Final Check
With the vehicle back on the ground, inspect the diffuser from behind and below. It should sit completely flush, align with the bumper line, and show no movement when gently pushed upward at any point.