What has been your results? What improvement did you have at the track? Did you have a dyno after installing? If so, what were the results? I would like some fact based input, not just opinions.
I have a 2002 5-speed, and I get 20-22 in town. 20 when I'm running it pretty hard, and 22 when I'm driving regularly. I usually go to the races once on each tank. I get 26-28 mpg on the highway.