Re: Can someone explain the advantage of X pipe over H pipe or cross over pipe for 2007GT
X-pipes and H-pipes are crossover pipes.
By connecting the two sides of the exhaust system the scavenging efficiency is improved. An H-pipe works very well for this for applications requiring torque; it provides slightly more backpressure, whereas the X-pipe is more efficient at scavenging exhaust gases and therefore is better for horsepower and top end.
So... if it's a daily driver that you're just looking to enhance a little bit go with an H-pipe, but if you really want to get the most power from your exhaust modifications, go with an X-pipe.