2 ways to get the finishers off as the are attached, each by 4 nuts from the back side of the rear tail panel. The obstacle after the mount nuts is the 4 flanges wont ley them pill through the rear grill without removal.
1. The book way is to remove the rear bumper to unbolt from the rear. ( Shop time at your dealer rate is about 4 hours on average )
2. The short cut when Alan installed his was by removing the rear engine lid to gain access to the 4 bolts. Bent the metal tabs in of the OEM finishers to pull through the rear grill, the CF finishers had enough flex to bend in on their own. This was on a coupe so I am not sure if removing the rear section of the engine lid is any easier than the bumper.
PS.....Sent you a PM about the carbon fiber plates. for some reason our server did not capture your email address. Sorry for the delay in reply.