the only factor that is definetly better in a 6spd is the extra gear for saving gas. when they did one of the first evo v. wrx the evo won on the road course because the wrx had to shift more and the sti stayed in 3rd most of the time. that was when evos was a 5spd. now its a 6spd because of gas saving for high speeds, and its more popular (people automatically think 6spd is better).