since im goin to be "doin up" the ute i was thinking bout dumped the exhaust b4 the bak diff ( my workmate does exhausts said he can do it for a few beers) question is how far back should i dump it? behind from wheels? infront of bak wheels? how much backpressure does the motor need ( its a s20de) and my current exhaust is 2.5 inch with a different manifold, he said he will make it interchangeable for me so i can run the half system or ful system, ne suggestions?