I have a 2003 gt with 40 series flowmasters welded in on stock exhaust. Do I go with a off-road h or x pipe? Which brands do you like? I am leaning towards a h-pipe because people say it is louder and it has deeper sound.
I also hear that x-pipes flow better and there is more hp gains. If there is not much difference in hp gains then I want to focus on a deep & loud tone. Is there that much difference in hp gains? I am going to run a off-road system. What do you guys think??

I also hear that x-pipes flow better and there is more hp gains. If there is not much difference in hp gains then I want to focus on a deep & loud tone. Is there that much difference in hp gains? I am going to run a off-road system. What do you guys think??