I have an 89 5.0 With GT 40 heads and intake, b303 Cam, shorty headers, pulleys and an off road h pipe, the mufflers on it suck and the rest of the exhaust is cut-off behind them. So I get the exhaust in the passenger compartment. I need to know who has the best cat bak system (performanc, and sound ) for this set up. I dont want it to be annoying loud, just sound good. Thanks