ok I'll keep it up -- thanks for the comments. on the volumizer box: well, I had to do a considerable amount of interpretation. All I have is a hard copy (fax) of HP versus speed. I had to visit with Chris @ PDQ for some time before he and I could dial in the right interpretation. for example, we didn't know axle ratio and we didn't know tire size. But by the time we let the data speak for itself, the graph suggests an automatic, 3. 73 axle, and 245/70-17 tires. did they put those tires on the 2WD trucks?
The fax I have doesn't really do justice to the volumizer in my opinion. maybe most folks don't look this hard at the numbers, but holy smokes margaret this bad boy pulls 50% harder than stock from 1850 to 2700. none of the other pressure boxes do that -- probably because this one does timing as well. The dyno run doesn't go down below 1850-1900 so we don't know how well the power comes in at low RPMs. but the mid and high end look very nice.
I'm collecting more info about the VA box and will publish an update soon.