A different ratio will increase the amount of times ure drive shaft turns per revolution of the wheels.(obviously)I wouldnt put ure 10 extra kw down to FD. It MAY do something for ure torque figures, but ive never heard of any dyno gains showing due to FD. Perhaps if u put ure car on the dyno before and after the different FD, u would see what Dyno Dave means by a "small margin", practically nothing. Many S2000 owners have changed their FD and apart from a shit load more response and shorter gears, there are no reports of increased dyno figure, then again they're different cars with a different layout. Any advantage ure FD has over ure mates car wouldnt really be evident on the dyno. Thats my 2c in my experience.