Do a search on facebook for Mickael Rabilloud. He is making a complete CAD/CAM inventory of every part on the P-40, Me-109, FW-190 and other aircraft from both blueprints and 3D scans of original surviving parts. He will eventually be able to build those aircraft and others from scratch. I'm pretty sure he would be able to build you a complete P-40 exhaust stack to your specifications. He just built a beautiful exhaust stack for the Mosquito which is displayed on his facebook page.
I'm sure there other people that can do it as well. Have you tried contacting Pioneer Aero, AvSpecs, Chris Prevost (P-40 TCDS owner), etc.?
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