The closest matching header i cound find, was made by Doug Thorley.
Its ceramic instead of stainless, and they are worth more new than i paid for the engine/trans. But, theyre only available in ceramic coated and mine are stainless. Both have 3/8" flanges, 1.75" primaries, and both have a d.side header that wraps down under the motor. I bring this up, because i was unable to find collector gaskets that matched the flange, including gaskets from Thorley. So mine are either old ones, or some other brand i cannot locate. So after a bunch of wasted time ordering miscellaneous gaskets that didnt fit, and i finally broke down and made my own set.
They are made from a sheet of Percy's carbon collector gasket material, available from Jegs for $12. it looks like carbon sheet with felt on both sides. Apparently they are working, because i dont have any leaks, altho it does not have much run time on it at all, so we will see.
I finally got the exhaust done yesterday. Its tucked up as high as we could get it. Actually, i removed my OBA tank to make room for the muffler, so i am going to remount that in some free space under the tool box next to the batteries.
The exhaust is 2.5" into the Y, 3" out, to a Flowmaster. Just a mild rumble, nothing crazy, and its nice & quiet. IMO theres nothing worse than a loud truck when youre trying to hear your spotter offroad, so i think this will work out well.
The O2 sensor is in the top of the y-pipe, but you cant see it.
Looks like a tight fit but its not, the pipe is right above the spring, and still underneath the bed. The tire comes up into the wheel well and slightly rubs the side of the bed, but will never come close to the pipe.
These pics dont show it well, but the pipe exits right next to the shackle hangar. Its tucked up pretty tight, but i didnt notice until now that the pics make it look like it sticks way out. I dont think ill be able to smash it on anything.
There was no room for the muffler forward of where it is, with all the extra xmembers under there. And once the muffler was in there, the only way to get back to the pass side was to made a 180º bend, so i opted to have it go out the d.side. It is a very tight fit under there with 3" pipe. I could have had the muffler go on straight and then have the pipe run under the tank & out the pass side, but ive already smashed the tank a few times, i know a 3" pipe wouldnt survive under there. This whole exhaust is a series of compromises to get the pipe tucked up where i wont smash it as easily.