Anyone know anything about draw through setup's?

Also, can you determine the turbo specs from these numbers?
I am having them rebuilt soon though before installation,

http://www.knology.net/~poison/Firebird.htm

Pics on the bottom of that page


RAJAY Turbo's

Model # 3AA1EE1081
Serial # 0112615
Part # 600586-05

Model # 301 E 13
Serial # 0056876
Part # TC-188-99

THANKS

Any pics of a draw through setup would be great, does the gas/air actually go THROUGH the turbo???!!!!

 

How are those things wastegated?