Update: 7-12-16
I was going to temporarily use my stock exhaust manifold, but discovered a micro-crack
where it was obviously over-heated when the engine ran out of coolant.
So... now I'm going to spend about $1,000
for a Doug Thorley header and new 2.25" exhaust pipe, and will most likely have to buy a new cat and muffler.
Gnarls.