A buddy of mine (on here) did the conversion on his 2010 but was fortunate enough to score a complete rear including the bumper cover, diffuser and skirts. After being around another friend's 2014 and his 2010 done, I am thinking of doing the same. My question is can I use a base 13/14 bumper and perhaps buy the diffuser separate? Or do I need a GT bumper or something to start with? I don't mind buying the cover, diffuser, and lic plate section separate but my main concern is if all of the bumper covers including the base models can be used and add the diffuser to them?
