u/Careful-Moment591

I want to put bigger tips on my 09 300c. I was told by the guy at the body shop that if I got any larger exhaust/exhaust tips id burn my rear bumper. Does anyone have any advice or tips? Ive seen a couple early 300c with larger cutout diffusers, but just didn't know what path to go. Thanks in advance.

Edit: I plan on doing full exhaust kit, just got my longtube headers in the other day, not just adding tips.