The biggest issue I had (have) with my Mo-4 is getting the rear of the car to hook up so that it doesnt slide in the sweepers and so that it can put the power to the road out of the corners. In the rear of the car I have the 2 Deg. toe blocks the shocks have red springs and 30WT oil. In the front of the car the Shocks have blue springs and 80Wt oil, I also use the sway bar kit, but typically I only use a bar on the front end. As for tires I use the Tamiya slicks in the front I use a red HPI inserts (cut to fit) and at the rear I use the soft Tamiya foam strip. One of the biggest issues with the Mo-4 chassis is that its VERY unbalanced. Spend some time with the car on a tweak board and mount the electronics as far foreward as you can to balance the car. The ball diff helps the car alot but be sure to set it right so that it doesnt spin "open". Hope this helps.