Installed my Whipple Stage I kit about a week ago. First thoughts are it definitely has more giddyup and the shifts are smoother, but the transmission still feels a bit clunky at times when accelerating slowly. I think it is when it skip shifts from 4-6 it is sometimes jerky/delayed.
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Also, I am sure it has been mentioned by another member before, but there is a plastic bracket that sits in front of the stock intercooler (kinda surrounds it) that has to be removed to be able to fit the Whipple Mega Cooler in. The directions provided fail to mention this, but I called Whipple and they are aware and stated the next revision will include this detail. I will take a picture of it when I get home.