Hi if you look at the top of page with exhaust off the car you can see there is adjustment but how much I don't know .
I've had a look at bobs at tarmac pictures at Gaydon he has a nismo rear bumper and the tips on his stick out quite abit .
I think mine sounds great not loud but I have been told if I change my cats it comes alive.
Might be worth a call to Bob and ask what he has and ask about adjustment on the invidia he fitted mine