I have a 460 BBF that's getting a TV8101 turbo. Currently, the engine is N/A and ~550 hp. The engine will have new bottom end with lower compression and a milder camshaft. From my old engine, I'll be re-using my aluminum heads.

Assuming perfectly steady state conditions:
The area of (4) 1.75" primary tubes is 9.62 in^2. This leads to a crossover/collector with a diameter of 3.5 in (9.62 in^2). Next, a merge will combine the two 3.5" (total area of 19.24 in^2) to a 5" diameter tube (19.63 in^2). Now this merge goes into the T-6 turbo flange (2.3" x 4" flange = 12.6" circumference). A 5" pipe has a circumference of 15.7" which is too large for the T6 flange. The best fit for the T6 flange is a 4" pipe (12.56" circumference). This is completely ignoring any cooling/contraction of the exhaust gases. This leads to my question ---->

Has anybody taken temperature measurements at increments from the engine to headers to collector to crossover to merge to turbo? With some temperature readings, I can design for a steady velocity (my goal). I want to design the exhaust as efficiently as possible by minimizing the velocity and shape/size changes throughout the system. Because I'm building it from scratch, there is very little cost difference between "right' and "wrong" .

Discuss...

Have a good day!
Michael

Edit: Clarification...