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well. i live in the frozen north, so summers are spent driving (and keeping the car in brakes and tires) and winters are for futzing around. given that, my car usually gets on the road in the spring with a number of mods, and any increase in performance is hard to attribute. further, without dyno evidence, all comparisons are to my hazy memories of how the car performed from the fall previous.
having said that, i feel there is an improvement running the 996 tune. a totally subjective, seat of the pants (literally) statement. i have nothing quantifiable other than improved lap times which could easily be due to better driving or better tires. i assume the improvement is not so much in fueling as 14:1 is 14:1 in closed loop and i don't think they run the 996 leaner than the 986 at wot, but with the timing. i could possibly log the timing advance with my pst2 (not even sure if it can measure it) but have not bothered; i am happy with the changes i've made.
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