Its a pita to remove. There are three huge strips of double sided tape and plastic clips and then two nuts, one at each end of the spoiler. The biggest pain is the tape. You have to heat it up pretty good and slowly work it up from one end to the other. I destroyed mine by melting it with a heat gun but I was taking it off because it got scraped up anyway
WD40 and dental floss with a steady(like flossing your teeth), but light rocking pressure and PATIENCE. It is the same method for removing the body side molding/shaving them on a 300C. A hair dryer set on low is OK, but NOT a heat gun! Damage will occur to the paint. Have fun.
The the R/T and SRT rear spoilers both have the exact same mounting holes and hardware.
Stock R/T and SRT rear spoiler is held on by:
Two (2) permanently attached studs with nuts at the spoiler ends (visible on the spoiler when you open the trunk)
Three (3) clips, evenly spaced between the the studs (hard to get at but possible from the underside of the trunk)
Four (4) pieces of tape -- Two (2) pieces between the center clip and the outer clip on each side. Each piece of tape is 2" x 3" and is super strong.
You need to cut the tape (with something like fishing line) and then pop the clips. I would keep the nuts loosely attached to the studs when you pop the clips so that the spoiler doesn't "jump" when you pop the clips and scratch the trunk lid.
Note: If you break the center clips PM me, I might be able to help you out.