I had the AE on my 21 gtpp and with the resonator delete it sounds really good. The different modes are nice as well, but it just ended up not being loud enough for me. Went with C&L muffler delete and now it sounds perfect.
Ive still got the pirelli p-zero 255/40/19 on the front with over 17000 miles and they still have half their life. 21 twister orange gtpp
Replaced my rears with continental extreme contact sports 295/40/19 with just over 12000 miles
First off, glad you are ok. The thing that sucks the most is if he does have insurance, how much coverage does he have? Enough to cover all vehicles?
the same thing happened to me and i had to use my own insurance to cover repairs.
hopefully things work out for you