When you click on links to various merchants on this site and make a purchase, this can result in this site earning a commission. Affiliate programs and affiliations include, but are not limited to, the eBay Partner Network.
Don't see why you would need to remove the entire rear just to add that lower diffuser. I have the Tom's carbon fiber diffuser and I never removed my entire bumper. The only piece that was swapped out was the black piece of the OEM bumper.