Slipperential Worth The Money For Racing?

[luvsrc]

hi guys, i will be racing this summer, building my ultimate racing brushless emaxx, what are it's advantages(sliepperential) , and also which is best to get for suspension upgrades? ue or gorilla maxx g3 suspension,is flm hybrid bulks ok to get versus ue bulkless ?i do have 2 brushless emaxx, i will sell the parts and my other parts to fund my new gmaxx, thanks