The six speed sux if you have high HPdo to the fact as soon as you get into boost you have to shift, too short of gears! My honest opinion is keep the 5 speed and put in a gear set, you will be much happier! We have been messin with WRXs for 4 years now and the 5 speed works best for any racing enviorment, unless you are stock then the 6 speed works nice!