A friend of mine wrecked his 4dr civic ex awhile back, and before getting rid of it he pulled the head off of it. Since i plan on building a z6 really soon and i pretty much have everything short of an intake manifold for it, i was just wondering if his head would work with my car (its a manual). I remember hearing that there is a couple differences between the two manifolds, but i dont remember hearing if you can actually interchange them. Is it possible to use his auto z6 manifold on my (soon to be) manual z6 motor? If it is not possible my only other option is to use the stock d15z1 intake manifold on the z6 motor, and if i did that how bad would it be performance wise? sorry for the long post but i need some quick answers... thanks in advance.