[M2joey]

You will do one of two things with a square setup. With a narrow tire / wheel, you will induce a good bit more oversteer. In short, the rear will steer much easier and faster. You will also move more grip to the front of the vehicle. If you go with a wider tire / wheel for a square setup, you will induce understeer. It will take more effort to turn the vehicle.

Most experienced track / HDPE drivers will move to a square setup to improve steering response, move grip to the front and reduce tire expense. However, if you are looking for the ultimate in all-around grip, staggered is the best.