the H and X pipes are the style of the mid pipe they actually look like the letters. they are crossovers that equilize the pressure between the two sides of the engine which is good. im not sure what you mean by fabricated mid pipe. and the offroad just means theres no catalytic converters in the midpipe. most muffler shops wont cut the cats out unless your replacing them. if you want them out just buy a midpipe with them already gone?
1999 Cobra black with medium parchment interiorJLT CAI, RWR motorsports tune, Pacesetter Longtubes, o/r xpipe w/cutouts, Flowmaster Super 44s, built t56, Kevlar clutch, Nitto NT05R, Ford Racing 4.10 gears, MMR 900 rotating assembly, vortech v3 si, twin aeromotive 340s, aeroquip lines, 80lbs injectors