What kind of battery and charger should I get if I want it to go a little faster. I don't know a how lot new to the rc world.

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http://www.losi.com/Products/Default.asp x?ProdID=LOSB0101
Check out that website. They have four categories of batteries for you to choose from and the the performance levels each one gives. They should all work with the same charger.

I'm thinking of a buying my first nitro rc car, and I won't a good one that can take a beating.

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I've owned a few traxxas rustlers and never had durability problems with them. My friend hit a curb with my stadium truck going 60 and it flipped about 20 feet and landed on the sidewalk and had no problems at all.

I owned a duratrax buggy

The steering system allows the inside wheels to turn more than the outside wheel for circuit tracks. What type of steering is it?

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It's just an off set steering linkage.It's done by using a round or very flat v shaped servo arm