Will this scrape on steep driveways or inclines?

The M Performance diffuser extends the rear roofline moderately. Check your current ride height and driveway angle before installation. If you frequently bottom out on steep approaches or parking lot lips, test-fit first or consider a slight suspension adjustment to ensure clearance.

Is this functional downforce or purely cosmetic?

This is a styling piece that mimics M Performance proportions. It does not incorporate flange geometry or active flow channels designed to generate aerodynamic load. Install it for visual purpose and to match the aggressive lower fascia look.

What finish prep do I need before installation?

The carbon fiber arrives with clear coat applied. Sand and prep the mounting surface on your vehicle's rear bumper to ensure clean adhesion if using any additional sealant, then bolt the diffuser in place. Avoid abrasive pads on the carbon itself to preserve the factory finish.