Getting ready to have the new exhaust system installed. Don't know enough about duel systems to make an informed decision about whether to use H pipe or X pipe. It is my understanding that the H pipe produces more hp gain in low to mid range rpm and has a deeper tone. The X pipe produces more gain in the upper end and has a higher pitch. I am building a mild 327 ( L79 cam, 9:1 CR 1.94/ 1.50 valves, 600 CFM 5-speed) street car. At this point I am leaning toward the H pipe. Any though, opinion, experiences??
thanks Jim H.