i recently did the head gasket on my 2.4. and i had to remove the head from the block with the exhaust manifold still bolted up.. trying to get the manifold off with the head on the block is very difficult. i tried prying on it and wouldnt budge, you dont have to remove the engine, but i took off the rubber bushing on the exhaust hangar about midway of the vehicle and was able to give me enough room to remove the catalytic converter from the manifold. dont forget there is a bracket holding the manifold to the lower block. you might be able to remove the manifold from the head, goodluck if you havent done this already, i know its 2 months to late.