What's the benefit of replacing stock with these? Are these stiffer, and will expand less under pressure, aiding in throttle response? Are these smoother and/or more consistently shaped for better flow?
^^^ you got it. but we only have a 5" section from the compressor to the intercooler, so i dont think you'll notice a difference at all. if the other hose is for the stock intake, and you don't have a cai, then you might get some extra benefit.
actually, you got the wrong picture there. here you go:
it replaces the post-compressor hose and the pre-throttle body.