[Beastiek2]

01-05 DX same parts apply except for body kits, headlights, grills, fenders. So the exhaust from an 01 will have no problems on an 05.
Keep this in mind LX/DX are same the same minus luxury features. So what GS said is correct the header and cat are once peice. Finding an exhaust is not easy especially if you want to do other upgrades. Most DX owners get just a muffler welded to there stock pipe. This will produce the same sound and effects. Now If you wanted a good full cat exhaust you will need to do some mods. First replace your header with that of an EX then get a Random cat installed. You can then get an exhaust from on EX model. One more problem you will need to either cut and extend your cat or purchase a front EX sway bar. The exhaust will not fit other wise. But search there are exhaust out there - Goodluck.