gt to bullitt intake manifold numbers?

what kind of increase would you see going from the gt intake manifold to the bullitt intake manifold ... no supercharger or turbo.

i have searched through the forums for info on this, but all i find is people saying that it is really good for forced induction cars or cars with nos. but i haven't found any numbers for someone going from stock gt to bullitt.

trying to get an idea of what kinda of increase there would be. only mods are timing adjuster and underdrive pullies.

heh, i know it cost alot too ... but right now i'm not worried about cost, i just wanna know some performance numbers.

ok cool ... thanks! obviously later on down the road tossing a supercharger onto that would produce some really nice gains then.