savage x conversion battery questions??

[ratpower396]

I have done a brushless savage x conversion with a mamba max esc, an ammo 36-56-1800kv motor, 2 4500 nimh packs, stock spur & 15t pinion(i think), locked in second gear... If I switch to 2-2s1p-20c 5000mah lipo packs will I notice a great increase in performance & runtime?? also has anyone tried a 775 titan motor or the dewalt 14.4 in a savage?? I have seen emaxxes with the 775 or dewalt & they ran very well..

thanks for the input