Will this diffuser scrape on steep driveways or inclines?

The Taka diffuser extends the rear bumper profile slightly lower. Check your driveway approach angle and compare it to your current ride height. If you frequently bottom out at shallow angles, this diffuser will increase that risk. Mild approach angles and level parking will work fine.

Is this purely cosmetic or does it provide functional downforce?

This is a styling diffuser that enhances the rear bumper appearance. At street speeds, aerodynamic effect is minimal. It's designed for visual impact, not track-level performance. For genuine aerodynamic function, you'd need a much larger, more complex setup.

What's the clearance between the diffuser tips and the exhaust outlet?

The Taka diffuser is molded to work around most stock exhaust configurations. Before installation, verify that your exhaust tip positioning allows safe clearance from the diffuser ends. If you've modified your exhaust system, dry-fit the diffuser first or reference your exhaust manufacturer's layout to confirm compatibility.