Got it, I will stiffen the diff on my car before next Wednesday s race. I'll also check the track rules on aftermarket parts but considering a couple guys cars were pretty blinged out in blue anodized parts I'm guessing the track is prety loose on chassis hop ups as long as your using the Johnson motor and no speed gears. Last question before I start applying these great tips, shorty or full size lipo? I figured for weight purposes the shorty would be best so that's what I used for my first two races but I've heard some like the car better with a full size lipo just curious the benefit? Thanks again for the help.