I've had the manifold off 4 times, and never replaced a fuel line once. Accentually installed the banks, and it will make a world of difference, simply because of deleting the swirl valves. I deleted the swirl valves on the factory manifold but ended up having a boost leak where the swirl motor is under the manifold" my fault in a rush" but the factory manifold is plastic junk. If you need step by step intake manifold removal just msg me. It's not bad at all just looks overwhelming. And you can reuse the gasket as well.