Update if anyone is considering purchasing these. Decided before tuning to see if o2 sensors needed to be replaced, and they did.
I did notice that when I was taking the sensors out, one of them lost the steel wool I used for the cheap method
The z1 gaskets are junk and leak, which I found out after installing, so after I install the fast intentions gaskets I’ll give the mounting brackets another go and update on those as well.
Since it’s warming outside now, I have been able to get more of a feel on the sound from these. I do feel like I lost power when compared to test pipes, and it doesn’t have that loud, raw sound anymore.