Is this a good idea or a bad one?

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)