No, I do not have the modified TB from Zabtek on there. Yet. Kind of waiting on a little more disposable income to come in and a way to keep it under the wife-radar... The tune from Doug though seems to really help out with the throttle response. I like to think that stock, the engine thinks and decides if you really need to press the pedal down all the way or not. How can the ST see that 18-wheeler bearing down on me and decided if I really need the throttle or not??
I got the 87 perf tune, 93 perf tune, and a 93 torq tune (towing). I have never tried the 93 perf tune, but have used the other two and they both had positive results.
As far as power goes, there seems to be more off the line, but that is only with my butt-dyno. No actual number to back it up. The rear tires do break loose if I stomp it now on dry pavement(ntil the fronts grab), but that could be my worn out Michelin Cross-Terrains in combination with the improved throttle response.