Here's what i did when I installed my sharps intake manifold. A good trick to get the stock line off the fittings without cutting it is to heat it with a lighter or butane torch for a couple seconds and you'll be able to pull it right out.
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I'm not even sure which line that is exactly, connects to the throttle body or something right? When I get under there I'll check it out. I have an RB pcv kit that uses a barb instead of the normal position so I'm not sure what goes where yet as i haven't investigated it. Once my subframe is back in ill start messing with the other engine stuff, don't trust this engine brace.
He's referring to the hard plastic line tucked under brake booster in this pic (normally rotated to TB)