I was looking at the SP Motorsports site and was looking at the different intake kits that they have and I don't know which one would be the best or the best for the $$. I assume that the cold air intake would be the best since true cold air actually takes air from out of the engine compartment, however, how much of a difference would there be if, for example, I went with the Kurtz True Rev Induction Kit (by the way, what is that exactly) or the SHO Shop cold air induction Kit? Also, what is the K&N FIPK? Thanks for the info.