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I heard someone one time come up with a thought on cat products and that is if it moves don't use it. Basically CAT products are not exactly known for being high quality, you get what you pay for and although I don't hve verification of it Ihave heard and from what I have seen C.A.T. uses left over or stuff that didn't pass quality inspections of other companies
Go with Eagle or scat it's worth the little extra money
probably go eagle SIR's. is a stealth intake really enough for 6000 rpm? claim is to 6800. building with edelbrock heads and bigish cam(not sure which). want to scare 600hp.
Never bothered myself as they are only marginally better then stock (assuming your talking the SIRs) But yeah seen several guys that have broken them a little over 6000-6500rpm which is a little low on the rpm scale of where your going to need to be twisting a 460 to be pushing 600hp