Ok, I'm kinda new to this exhaust thing so please excuse my ignorance...I want to put true duals on my GP and I was looking at these two Pypes kit. One is a crossmeber-back with X pipe and one is a converter back. So, what's the difference? What's better? My car has the 4.4 305 V8 and I wanted the violator mufflers for extra volume. Thanks for the input