For get about using PVC for mock up.
Get some heat exhaust manifold heat riser tubing. Its like an all metal clothes dryer exhaust vent, but a lot smaller.
It should be available down to about 1''.
Or if you want to use real small tube get some electricians to bend you up tubes out of 1/2or 3/4 inch EMT conduit. Electricians are great at putting smooth wide radius bends in tube to go around obstacles or fit in a tight space and then making copies of a tube.
You can even get stainless steel conduit.
You could have electricians bend up some cheap galvanized EMT in what ever size you desire, then once you know it works have them copy it in stainless.
Those bend radiuses in the drawing look pretty much exactly like what you get from a conduit bender.
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1984 chevy suburban, custom made 6.5L diesel turbocharged with a Garrett T76 and Holset HE351VE, 22:1 compression 13psi of intercooled boost.
1989 firebird mostly stock. Aside from the 6-speed manual trans, corvette gen 5 front brakes, 1LE drive shaft, 4th Gen disc brake fbody rear end.
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