Hey guys, currently got a FG tuned to around 300rwkw, looking to get a little more sound of it, currently got a venom hi-flow bolt in cat with stock dump/cat-back. Getting a middle muffler delete will run me $200 at a local exhaust shop so I was thinking it might be worth just going for a cat-back system. Looking at X-forces range of cat-back systems I got quite lost at which cat-back system would be suitable as I'm planning on upgrading to a X-force cat/dump with my next stage of upgrades. Which X-force cat-back system would fit to a Venom bolt in cat and would this system also work with a X-force cat/dump later down the track?
Also I've read that any changes to the exhaust system from behind the cat don't require a re-tune, is this true?