I love this question. If your gonna go big block Tmaxx spend the money and go supermaxx or other high quality stuff . Get the Tranny and drive train ready to handle the conversion first if not you'll spend more time fixing then playing. If your on a budget then upgrade slowly. But be for warned the Tmaxx doesn't have the most hop ups avaliable for nothing. Don't get me wrong a .21 maxx done right is one of the best trucks you can have but it has to be done right.