Is this a good idea or a bad one?
 

Does anyone run an X-pipe on their car, what have you found different about it verses an H-pipe, and did you buy it or have some one weld it, on or can that be done. How much did it cost you and is it worth it.

All the mags say that an X-pipe will net you a few more hp but I'm very happy with my MAC Prochamber. I don't think it really makes much of a difference.

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1984 1/2 GT350 (#842 Hatchback w/ T-tops), 302HO, Comp cams Xtreme Energy cam, Carter 625cfm carb, Weiand Stealth intake, MSD distributor, MSD coil, FMS 9mm wires, 1 5/8" MAC unequal shorties, 2 1/2" MAC Prochamber H-pipe, Flowmaster 2 chambers, KYBs, 16"x8" 4 lug Cobra Rs, Falken 245/45ZR16s

The Xpipe will get you 3-4 more HP over the Hpipe.....if you use high flow mufflers and not a chambered muffler. If you use a chambered muffler, the Xpipe will actually lose HP.

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'90 LX 5.0; 12K original miles (no sh*&); 3.55 gears; pulleys;Edelbrock Performer Heads; BBK shorties; MSD 6AL box w/ blaster 2 coil; Motorsport E303 cam; Pro-M 75mm MAF; BBK 70mm TB; Eibach spring kit; Southside welded subs; K&N cone filter charger; Hurst shifter; fiberglass turbo hood; A/C-less; rear seat-less; cat-less; 2 chamber Flos; Corbeau racing seats (fronts);
30# injectors; 190 lb fp; FPR; TFS track heat Intake - 12.513 @ 112 mph (Pre-inj/fuelpump/FPR/intake)