Batteries play a large part in how well the Mamba setup works for you. Speed vs a 10/5 or any other motor for that matter all depends on alot of varing factors (batteries, gearing, vehicle it is in, and driver) all play into it. I race against a buddy using a 10.5 Orion and he does run faster times than me (he is a better driver) I still have more rip than him using my 4600.
Castle Creations (Since 2005)
Bumps & Jumps RC (One of the best racing facilities around)
ST Racing Concepts (STRC) Great aluminum upgrades for many brands.
Custom Works (Best Oval Cars around). Too many titles to list
Shout out to: Sticky Kicks, CR Graphics and Race Ready Products