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The route George states sounds like the best way to go and experience goes a long way as far as proven results go.
If you want to fabricate your own and use stainless steel here is what I did and had good results.
I put a Buick V6 in my PV444 and made my own exaust headers, both sides, for it since NO ONE makes them for this conversion.
After trying a wire feed welder and a torch with sad results (stainless will melt and sluff when hit with a torch and also get weird results with a wire feed unless a special wire is used) I finaly went to the local welding supply house for help.
Wound up with some silver brazing alloy rod: Made by Harris out of Cincinnati, OH. Part Number: 40235 and is called "Stay-Silv 5, 14 sticks , 1/8" dia. and 20" long cost $ 23.00 Using a small tim on my torch the pipes for the exaust manifold welded together beatufully. When done, I ground them down smooth, bead blasted them and then coated them with Eastwood exaust paint. It is a brush-on paint that will withstand 1500 degrees of heat. Since it is heat cured and I woulden't be driving the car till later, I cured them in my bar-b-q at high for about 20 minutes before I installed them. This allowed me to handle them without messing up the coating. It looks like a new casting and holds up for years, dosen't discolor and they looked like factory headers. You can also join stainless to regular steel if you have to.
If you are a novice at torch work have someone weld them for you, but it works good and looks great.
The way George suggests is using a pipe that has some engineering behind it as far as flow and back pressure which you won't get doing a home brew job. I had no choice but to fabricate mine but that gives you an alternative if you don't want to buy a ready made.
Good Luck,
Dennis
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