Hello Paul
How critical is the 2" i.d. for the P port tubing?
U tubes are sold by Wagner w/
 2.375 o.d. .154" wall for $51.51
Burns has
 2" o.d.

It will work of course.
We used 2 inch OD TUBE but your right about Wagner pipe.
Technically that is 2 inch PIPE and not tube.
The trouble with it is the bends get heavy.
Our first cast aluminum turbo manifold was designed around pipe
as it was cheaper. Then Wagner raised the price.

Here is a PIPE chart showing the standard sizes.

Paul Lamar ...No rotor no motor.

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