An H pipe is just what it sounds like, just like T-Bone said, it connects the headers/exhaust manifolds to the mufflers.
If you took it off the car, it would look like an H...two pipes running parallel with a pipe connecting the two.
You could also look into getting an X pipe, which is what it sounds like...replaces the stock H pipe and looks like an X...that's as simple as it gets.
As for performance, if you want something you can feel, get gears.
4.10's
or 3.73's if you do a lot of highway driving (that's what I have)
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1998 Yellow GT
Appearance Package
Black Hood/Fender stripe
17" Wheels
FMS 3.73's
Steeda Aluminum Pedal Covers
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