When I bought my TRD header and cat-back, they had two options on the cat-back 2.25" and 2.5". I told the tech at TRD that I pulled a boat and wanted the best setup. He said their header teamed with the 2.25" cat would keep the low-end intack on my non-SC engine. Brew <img src="/forums/images/graemlins/cheers.gif" alt="" />

98 T100 SR5 4x4 3.4L auto, TRD Goodies, Bilsteins, engine/TC skids, 2" body/d.train lifts, F/R ARBs, 4.56 R&Ps, Aisin hubs, 255/85R16 Dunlop Rover RVXTs (street), 16x7 +8mm offset wheels, custom bumpers, Warn M8000, Master-pull synth. line