x - h - or true dual
IMO, the H-pipe is worth the few peak horsepower for the better sound. i'd rather have a car that sounded better and ran .05 slower in the 1/4 mile than a car that's a tad faster and doesn't turn as many heads. but that's just me.
if you have big plans for the car (a stroker or heavy FI), you'll probably want the X-pipe as the peak gains will be more significant (it won't matter much on a stock or lightly modded motor). for a track car, it's a better decision, but for a street car/daily driver, IMO the better sound through an H-pipe and better low-end throttle response is the way to go.
http://www.donjohnii.com/Pages/Exhaust_Clips_Page.html
It is Mustangs, but you can hear similar set-ups with the only difference being an X or H. Personally, I like the X because I think it has a more crisp sound to it.
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