I replaced the stock filter with the Airaid filter, K&N didn't have a model out at the time. I kept the stock air box but replaced the Mass Air Flow sensor with the Granatelli and also installed the Modular Intake Tube.
Personally I think there is something in the programming of the stock throttle that makes a difference. I also own a XL Denali that has the same engine and weighs about the same, but the throttle response on the Denali is much better. The throttle is eletronic and not linkage and I believe there has to be some difference between the two that effects the throttle response. BTW the Denali runs 3.73 gears and the H2 has 4.10.
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