exceed hyper speed engine upgrade HELP! !!!
 

Hi guys,

Really need to know if i can put a. 21 engine in my exceed hyper speed. .. been reading up and have heard .18 is way to go but if i chose the. 21 would it fit, it's just a beginner model, have done some aluminum upgrades. .. has a .16 in it as standard for the model. .. will a .21 fit straight in with little or no mods or how big will mods be... can i buy a roll cage as well... have heard it will fit and some say won't so pls help