he is right though, on top of that when the filter is in the fender it gets more contact w outside air so its more like the entire surface area is being utilized whereas with the under hood set up its really mostly the front, the few set ups that ive had ive alwayse had better luck with the fender mounted kits, it isolates the air and pulls in a bit better, you dont really have anything to stop the air flow or heat it up, so the result is better throttle response. and as far as the tubbing material, this is what k&n, jegs, and bbk all told me!!!! you have a few basic types of intakes, you have the metal, plastic, fender well, classic in bay (under hood, stock placement), and ram air!!! ok so, ram air rally isnt gonna do too much for you unless your constantly driving at higher speeds, it just looks cool. and on top of that the air that it does draw in has to be channeled through many bends and restrictions, that is why the cars of today also have a secondary method of drawing air!!! so aboce all the ram air is for looks, the classic set up is fine, but you are prone to heat soak regardless of tubing material, and you got to remember that the filter sits right behind the radiator so as soon as that air passes through the radiator its nw hot air instead of cold air. so now you have the fender design this more or less eliminates the problem of pulling hot air from around the engine and through the radiator, so instead it pulls cold air from inside the bumper, which has bn the most successfull i guess. there are other kits out there that just utilize a heat shield which basicly does the same thing but not quite as affectively, but its still way better than the classic set up. so now on to material. they said its really quite simple, hurt was right on the money here. the metal heats up faster but doesnt hold heat nearly as long, however the plastic heats up fairly slowly but retains the heat for a long time. so i guess it really depends on your app, but it seems like for most daily drivers the best set up according to these guys should be a system put in the fender well, now as far as the material, if you could get a metal tube with heat deflecting paint then youre good to go because that cool metal will in turn cool the air inside the tube but thats just it you need a way to keep that tube cool. many companies sell things for just this and i have no idea how well they work but from what all these guys are sayin it is a good way to get the most out of your cai. now i dont know exactly how true all this is, but it seems to be the same answere from all three companies so im sure it cant be too wrong, and of course as we all know a tune surely doesnt hurt to pull more power!!!