You dont have to believe me, but, go check out gale banks website. Hes into diesels mostly now, going for a land speed record in a cummins powered dodge dakota. He builds alot of twin turbo big block chevies for marine applications and that is one of his plenums. I think now he has incorporated a liquid intercooler into the plenums too. At one time i wanted to purchase one for my GS, as i was going to do a similar twin turbo setup as shown in the picture. I was going to use a intercooler though.
Ask anyone who knows that car, ill bet you im right. Unless of course it has TBI or something of that nature.