Can I Install The A2A Kit And Just Run The 10 PSI (87mm) Pulley Untill I Get The Car Tuned?

Driving the car in this state is extremely difficult and is not recommended regardless of pulley size. Although no damage will be caused to the engine itself, sudden stalling can be a safety concern. Another issue you may experience is contact between the pulley and bonnet which can be resolved by running a 19 PSI (2.55") pulley or by relieving the bonnet ribs. However if running the 19 PSI pulley, do not drive the car hard before untill it is properly tuned.