rear. Handling is very neutral. The tail kicks out occassionally when I try to exit a turn to fast (as the boost comes to full spool) but i only ever have experienced oversteer when applying power too fast. I might explore wider wheels and tires for the rear when I get more power, but that is going to require wider fenders. So far I am very happy with this combo and how balanced it is and have run laps at TWS of 2:01 and 2:02's. Unfortunately I have only had one day of an open track session to play with this setup but I would estimate I shaved at least 4-5 seconds/lap over my previous wheel/tire combo.