The air at in the fender liner is cooler, there's no question about it. An SRI actually sucks in hotter air than the stock intake, because the stock intake scoops air from the fender, behind the bumper, and under itself. Honestly an SRI rarely improves performance over putting a good filter onto the stock intake. Is a CAI going to be a huge improvement? No, almost definitely not a noticeable one, but its going to be a measurable HP increase over an SRI. Honestly most people who buy SRIs over CAIs are just afraid of hyrdrolock.