MBX-5 going BL. Center diff question.

[SilentMonster]

Thanks to Mike and everyone else. I'll get the HB stuff on it's way. Now to the fun stuff. First off I should point out this will be a race buggy for racing with the "nitro guys". I really want to run the Neu motor because of their efficiency and US made. I also think the MM is the cats meow. Ya I've also been waiting for the MMM but want to be rolling by late march or so of THIS year LOL. Well I guess I will stick with the Neu. So is the Quark monster pro 125B(heat sinked) and the Neu 1515/2.5D the ticket or is there a better setup for the money? I want to be able to run a 20 min. main so I figure the 5S 10Ah will be more than enough. I take 4200Mah on 4S in a 10 Min race with my 10.5 lb G2R with the HV6.5 and I'm sure it's not near as efficient.