Today I took a trip down to ILR and I played around with a couple different aero packages on the Lefty Performance MR03. The first time out with the new 599 shell I opted to try no window. To my amazement, I found that I had more rear traction than I did running with the lexan window. This allowed me to drive a bit more aggressively, with more exaggerated throttle and steering inputs. My theory on this was that the lack of a window allowed more airflow directly to the wing. The second setup I tried was with the stock, autoscale style window. With this setup, I noticed more body roll in the corners and a bit more stability. With this window installed, it took more effort to make the car transition laterally. My fast lap today was the same with the stock window as it was with the lexan window, but I would say my average was about .1 better with the lexan window because the car changed directions quicker. In a low grip situation, I would give the stock window a try. Today I liked the lexan window best, but experiences may vary based on driving style and setup.
