hey, today i squoze an os max .18 cr-v in to my 5+ year old .15pro rustler .on my 5th tank at break-in's end. i can not pull the throttle wide open, from dead start,truck flips on back. from 15 mph the thing will ride 150ft= Willie.funny how i spend lots on carbon fiber top deck,shock towers,ect.....,then need to ad weight to drive this monster.believe it or not,this might be too much. .i was running os.12 but recoil broke,for the last time. think ill fix the .12,and put it back in rusty. probably fit the .18 in my revo. bought lots of extra parts for rusty. but after 2 gallons of nitro and accumulated close to 1/4 mile of hang time(big air) still have most parts new. it's a tank. ps. don't go out and buy an os .18 for your rustler,unless you have a dremmel,patients,and money for new tires.