Industrial Metals Supply in Burbank CA
Has 4" by 4" by 1/8 wall 6063 T5 aluminum extrusion in stock. Perfect
for plenums. $2.74 a foot and they will cut it for you.

I have a couple of Mazda throttle bodies so I decided to use
one. It is less than optimum aerodynamic wise and heavy but it
will form the base line pressure drop for the dyno engine.

More later on attaching the stock throttle body to the four inch plenum.
There is a trick to it.

Paul Lamar
 
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