if you want realy good acceleration then buy a traxxas Resonator Pipe it gives the rpms a good boost like 3,000 - 5,000 more, but thats only if your willing to spend the extra 40 bucks on it. you should also buy some turnbukles (stock or alluminum will do fine,the only differnce is that the alluminum are lighter giving more speed but they break easyer than the stock. and once again if your willing to spend 40 bucks on them(stock are about 5 bucks for a pair).also buy the rear shock tower.

and the best site to buy parts is [link=http://towerhobbies.com/]tower hobbies[/link].