ImacFanatic, the 6deg caster blocks are like any other option parts...something to use for tuning the car. For me I use them when I want more mid to exit steering. Not saying this the only thing people use them for but this is how I use them. Best thing to do is go to your local track and do back to back testing with 4 and 6 degree blocks. You will learn first hand how they make the car feel to you when compared to 4deg blocks.