Hi guys, I have the red (19 gram) rollers in my prowler and would like to run 18's.. I'm hoping this will give me a little higher shiftout when on the gas.. It shifts out at around 5400 now. would heavier or lighter rollers give me higher rpms on takeoff?? I'm going with a slightly bigger/more aggressive tire. Anyhow, I ordered a set from EPI and when they came in all I got were the metal inserts, not the complete rollers... I can't get youtube on this comp. to watch the vid's and I was just wondering, do the metal centers just push out of the stock rollers? I don't want to have to do any cutting or mods to my stockers in case i wanna put them back in.. I've clutched machines before and I know it takes a lot of "playing" to get it the way I want..