Glad I caught this thread - as I have the sport pre-tire sitting in my cart to purchase for the 2022 Lariat I just picked up.Melted the plastic piece yes but happened while I was waiting on the Tremor non-air deflector pieces so it was fine.
Took the side steps off before installing. The plan, if I was going to keep the side steps, was to nip the rear passenger side short enough then put the end cap back on.
So factory length side steps won't work with the pre-tire, and the plastic deflector will also suffer some melting without modification??
I might just go with dual rear exit in that case. I had a borla factory exit on my last truck with the black tips, and could never keep it clean with all the debris being kicked up on it...