I dont know how much it helps going from 3.42's to 4.10's as far as acceleration in 5th gear but i think doing that swap is the least i can do to get it to pull better in 5th. My friends 01 M3 Vert 6 speed which ive had the same car as well in the past accelerates really really well in that gear and im trying to figure out down the road when i decide to send off my tranny for a rebuild can a pic better gearing for 5th and maybe 6th gear?