We've installed the factory carbon diffuser and rear under spoilers on our #HTSpecTLXS. Since the rear bumper comes off for both of these items it made sense do to them at the same time.

Rear Black Diffuser for A-Spec cars:
https://www.heeltoeauto.com/aerodynam...
Rear Carbon Diffuser:
https://www.heeltoeauto.com/aerodynam...
Pre-painted OEM rear under spoilers:
https://www.heeltoeauto.com/index.php...