I have the zzp billet fuel rail. The line clears fine, but then I have the wire harness on top of that. (both are going through the groove between s/c and throttle body on top)
I'm mostly concerned because the hood has to be closed pretty hard to fully latch, and when I'm popping the hood it's some extra under tension. I have to pull the release latch quite a bit harder than I used to. If I hit a hard downshift everything is going to press into the hood pretty hard.
BPV - this is what I'm most concerned with. it actually pops out of the 2 hole groove that holds it into the mount bracket because it's making contact at some point. not sure if this happens right when I close hood, or when the motor rocks around while driving. it still functions though even when it's not resting where it should, but I don't think it's happy.
Vacuum lines on top, and spark plug wire brackets also rub (bracket only not the wires), but I don't care as much about those.