I have the ESS and am very happy with the way it gives me completely new car with much different power delivery band, turbo kickin n much quicker and the car feels a whole lot faster,
But i recently measured the timing using the vbox using launch control and 0-100 was 5.1 secs and 1/4 mile was 13.5 secs - which are exact same as the stock figures for the 35i. What i am going to do is rerun the test with stock file and see what results i get
But definately with the change in power delivery graph the car feels much quicker vs stock on twisties
ESS all the way!