No why would it? because it has one more gear? nope. same motor. the 6spd is a weaker transmission when putting power into it. Also who wants to shift one more time if your running it in the 1/4 mile. Contact shep trans and ask them if they will build or rebuild a 6spd mr tranny for you. i havent seen anyone who does. The Mr for 05-06 either evo 8 or 9 the only difference is bilstein suspension, lighter bbs wheels, 6spd transmission, all aluminum roof, gauge package and special MR badging, and Vortex generator with zerolift kit for 06 models. All this can be put on a 5spd evo....or even better and lighter parts for that matter, the 5spd holds power better and its one less gear to shift during certain race events. Its your call but if you want big power go with a 5spd or prepare to buy and have it rebuilt to hold.