Picked mine up from Race-Tech perfect..
Ive had the system off twice to clean it/clean under the car/underseal the shell.. etc
Had to go back to a local garage with a ramp to get it right and to stop it knocking...
There is a lot of adjustability in an exhaust, even with flange joints.
Its a HUGE exhaust pipe to fit over a rear beam. The sweetspot/gap is a small one, but I can get mine perfect.
Ive been able to get it perfect without a ramp since too...