That's just it, you've heard enough aftermarket spin that it "seems" that the stock unit couldn't possibly be good. The fact is it's a very well designed unit, and so are the intakes on a lot of other rigs out there. In the old days we changed filter, carb,intake manifold and matched the ports to get more usable power. Now they just want to change a little plumbing that they charge you up the hindend for, and it's supposed to do the same thing. Well it's bullpucky. Today manufactures have to produce a unit that gets good power AND fuel mileage, the people and the government requires it, back in the old days we didn't concern ourselves with mpg when gas was 37 cents a gallon. 4WD&SUV mag got 2.5 mpg better mileage on their modified Liberty after a exhaust and intake change.
Now just tell me how long you'd have to drive your rig to make up the $500+ price tag at the pump. They dynoed a whole 4 ft lb more torque and about a whole 2 hp difference. Sounds spendy for what you get to me.