I saw a guy running a diesel, dodge truck with a cummins... he
had installed 2 turbos... one was normal and the other was from
a tractor trailor.... the smaller turbo provided the preasure to run
the larger turbo. The larger tractor trailer turbo provided the preasure
to the engine.... and this old boy was a hay seed.... but i think
he had these scientist beat.....

and if you just want a good intercooler then go to a junk yard or
to ebay and buy the one from a saab 900.... probably the best one
going...