I transferred mine when I had the full exhaust installed (if you do be very careful with the rings or cut the & purchase spares). I also have a spare body kit and didn't add the sound pieces to that and don't really notice a difference. On the heat shielding I just copied from the stock pieces or lined them up as they were cut to fit and you can get a good idea of where.
All I can say is that I have a spare bodywork without the pads and I have had no issues.