Join Date: Dec 2002
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Re: Wagoneer exhaust, dual vs. single
Waggies are tricky to outfit with dual exhaust because the gas tank on the driver's side is in the way. I toyed with the idea too but ended up going with the stock 2.5" single with a turbo muffler. I personally think that the 2.5" is large enough for a stock 360 and wouldn't think that a 3" would add any performance. Going with a larger diameter exhaust can actually work against you because of the lower velocities. This causes the exhaust gas to cool too fast and they become denser thus adding back pressure. I've done a bunch of research on exhaust systems and ran into a reference table that said that a single 2.5" exhaust is plenty for a 360.
If you are still set on dual exhaust, I would cut the Y near the bellhousing, weld 2" pipe on each end and use a single muffler with two inlets and two outlets, then run two tailpipes in parallel out the rear on the passenger side. If you're in a state with emissions controls, be aware that you could run into a problem with such a modification...