[HUMMERcustoms.com/TAZ]

I had Granatelli on 99 Silverado with 5.3L and felt it of little help. So did not even look at one for H2. Even under boost of supercharger I see stock MAF doing fine up to 10lb. boost setup maybe a little less. I will need to look at maping tuner software above 5lbs. of boost and just eliminate the MAF completely since I have invested in tuning software anyway..

Plus since I'm moving to higher boost anyway I'm going back and store a tune for 5lb. boost as well since i can change boost level with change of a pulley. Then just flash the tune that goes with it.

Just an opinion but, do not feel it is worth the money when You could go to a tuning shop and just get a better tune for even the stock setup which will get the hidden HP and torque. Custom tuning is not just for boosted engines.
Go get all You can wth MAF money saved by getting a custom tune. You will be pleasantly surprised. Custom tune will get You more than what a handheld tuner will get. Having the handheld just allows You to go back and forth when You want to be completely stock.

When You get any tune make sure if you go into dealer that You either return the stock tune or make sure the dealer knows you have a custom tune. If You do not tell service dept. when they hook up to do any diagnosis their equipment will automaticly overwrite the custom tune. It recognizes that something is different than stock tune and want to get rid of it. Then replace it with something normal to machine the dealer uses.

TAZ