Join Date: Mar 2003
Location: Fairbanks, Alaska
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Re: Exhaust recomendations wanted
Tri-Y headers are supposed to help torque at low RPM however, I am not sure there is room in a CJ for them. Give it a shot. For best low end torque you want small pipe in the exhaust that keeps the velocity up. Your header tubes should be small and you want small pipe clear out the back. I would go to a Single pipe of 2.25 to 2.5" and single muffler as single seems to give better low end. Also space is very limited on the passengers side of 76ish (can't remember the exact year) and earlier cj's between the frame and T-case, as the frame was straight and was latter made wider toward the rear. As for the muffler vs. Glass pack, I personally dislike glass packs. They tend to be leave the exhaust sounding like a series of shape cracks, this is very hard on the ears and tends to cover up sounds of things going wrong like gears, bad bearings ext. I like the standard NAPA mufflers as these are cheap and the one I got several years ago was made by Walker. It had a Nice deep rumble with out being to loud. I have had good luck using pre-bent pipes to build my own. I clamped them together under the jeep and then removed the exhaust as a unit and mig welded the joints. If I did not have access to a welder then I would have just used clamps but I think it sounds better welded, this also prevents leaks. Most States required that the exhaust ends either behind the passenger compartment or back of the rear wheels. It may pay to look up your exact rules. Straight out the back is likely best as this was stock and there is very little room in the spring-tire-gas tank area to turn out the side.