good advice. did you have to remove the radiator and such to get it into his DA? now when people mention collector size, what part of the header are they talking about? the final exit point that connects to the cat or where all the tubes collect? because a friend of mine has a real nice 94-01 GSR edelbrock header ($450) just sitting in his shed I was thinking about placing onto my motor. the only reason I have been hesitant on installing it and the reason why I bought a new one was because of the 4-2-1 two piece headers seem to install whereas the one pieces don't seem to fit in the aloted space between the block and the radiator. by the way, that edelbrock's header exit has roughly a 2 inch inner diameter.