I had them years ago on my 16 Camaro but only for about 300 miles before i sold the car and csnt remember how they handle highway speeds in heavy rain.
I'm at 7500, got mine in march 2018. I fly out of town alot so barely drive it other than the 1 mile drive to school. Most of my mileage came from 2 "2000 mile" trips
There is a thread somewhere on the forum, it has been done and you can use factory modes to switch exhaust notes. It's a huge thread and some cars have the factory connection already installed so all you need are the mufflers.