I just bought a ebay copy of the Spectre intake. I always thought intakes were BS anyways but for 70 bucks I could not pass it up (I am more in it for the noise). I dont get a mod budget any more so when i find stuff like this I jump on it. I do plan to modify it to make it a bit better tho, please read on..
To elaborate on what Moes Performance said, All of K&N's intakes have metal intake tubes except the 63-1561. and same goes with 99% of the rest of the aftermarket. Other than the diameter of the tube, and the better filter these intakes (with the exception of the vararam) are all the same. The factory airbox is made of plastic and does not soak heat as much as metal, and neither does the rubber tube, but the corrugated tube causes flow issues as well as the box itself - this is the same for most factory intakes.
so with that being said regardless of the heat shield and tube material and the intake the intake system is still INSIDE the engine bay where it is surrounded by heat, and its getting air to the box from the outside - just like the stock air box did. I am a firm believer that the little increase of power intakes claim to give on this truck is due to increased air flow, not because of lower temps. if its cooler air you are after my suggestion with an intake of this style would be to wrap the tube in header wrap, and put some heat wrap on the "heat shield".
All of the claims that one is better than the other I have seen on here is due to quality and claims of power on the butt dyno. i guess what im trying to say is every intake except the vararam is the same in a sense and the small differences are not going to make a difference, at the end of the day it is what it is. a tube with a filter.. if you want a sick looking intake then spend the money on it, but if you want an intake that will probably perform the same and looks cheap then buy the spectre..