Best Pass This Season

It's full exhaust on the street but I drop it when we go to the track. We were playing around a lot with different launch rpm. We tried between 4,500 and 7,000. The track wouldn't hold it above 6,000 but it left smoother with more rpm so most of the passes were about 6,500 launch. Thinking about changing up the rear suspension to get it to hook with more rpm and try to dip into the 9's.