Have you seen this? http://www.4x4wire.com/forums/showf...34324&fpart=1&PHPSESSID=

After researching this back for about 4-5 years on every forum I could think of, I've decided to use a good muffler shop near me to build everything from the Downey headers back. Starting with weld-on 3 bolt flanges on the header collectors, followed by flex joints off each header, then routing the 2.25" cross-over behind the transfer case to a y-pipe and step up to 2.5" the rest of the way, using a 2.5" in/out Carsound cat and a 24" Magnaflow muffler (I don't want it to be too loud). If you can find a place that will do mandel bends it would be great, but it seems no one around here has one for exhaust pipe sizes. The quote I got from the muffler shop was for $300 and I am providing the flex joints, cat and muffler.