Alright guys here some tips for the rear diffuser:
When you put the 3m tape on the rear diffuser line it up as close as possible to the outer edges on the top, I would suggest doubling (sticking another piece over the existing exposed piece) around the exhaust areas, where it curves around on both sides. If possible, I would suggest the stronger double sided tape mentioned in another thread, I don't know the part number?
~also heat up the carbon piece with the tape on it as well as the surface of the vehicle, i used a space heater, 15 mins before, 20 mins after It was put on with me applying pressure.
~there are 2 screws that need to be hand screwed in, for those of you worried about the damage done to the body, DON'T, these holes are located way inside and are unnoticeable, as well as very small, in fact if you don't like the diffuser for some reason, I don't see a problem taking it off, there will be no visible evidence that it once was there. As long as you can get the tape residue off.
~still waiting on the info for the center bolt, however it does feel secure enough to leave it off
~if you have exhaust tips that are close to the rear bumper, do not get this as it will most likely touch and ruin the diffuser, possibly cause vibrations as well. I do have a berk cbe which fits perfectly around.
Hope these tips help