The Dynamic Rear Toe kit is a bracket that bolts directly to your stock 350z knuckle and provides multiple outer toe are pivot points. This changes the amount of toe gain your rear suspension will get during compression. the top outer most point is the most neutral setting, and the lowest, most inwards point the most aggressive. The more toe in you have under compression, the more forward grip you get while drifting. Too much forward grip can also make the car harder to drive, hence the multiple points to chose from to allow for fine tuning.