whats the word on these things. i read they are good, then i read its hype, now back to good. are they good becuase they are fairly cheap, or do they move some air. i am talking about an s475 cut down to 2.8 with an 87mm exducer. are they a good competitive turbo(i know its no hx60), or should i spend a few bucks more. opinoins please