I had an h-pipe before I put my hollow cats back on. I loved the h-pipe, but for other reasons I had to put the cats back on. What I noticed from the h-pipe was a shift in the power band from 2-3k to 3-4k. Seemed like torque was being robbed from 1-2k band and given to 3-4k. But racing is mostly in the high RPMs anyway so its ok. Just get some shorty headers to team it up!
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Blueneonman - '95 5.0L Mustang GT Convertible | K&N Custom Cold Air Intake | FMS 9mm Wires | Hollow Cats | Flowmaster 2 Chambers | BBK Subframes | 6-pt Rollcage | 14deg Timing | King Cobra Clutch | FMS Adjustable Clutch Cable | Coolest Neon Lighting on a Mustang EVER!
Homepage:
http://www16.brinkster.com/blueneonman/
Best time: 14.578 @96.20mph