We have a 4400# 3rd gen Camaro running in Production and Altered Classes. When we were running 225+ with our "D" motor in Production class and with a full canopy 'chute, everything was fine. When we added some "juice" in the Fuel Altered class, we came through the lights at about 248. Pulled 'chute, 'chute hit, we got sideways about 45 degrees until the car slowed down enough that the 'chute got out of the dirty air and the car straighted out. For a brief moment after it straightened out, I thought I had done a heroic rescue.
Lessons:
1. Amen to mounting 'chute camshaft high
2. There is lots of room to slow down - we now use a cruciform 'chute (not a full canopy) and longer shrouds
3. The faster you go, the further dirty air extends behind you, and you may need longer shrouds to get into clean air