Ok ok I know everyone is on the intake kick right now, and has every rightto be, but I am wanting to see/ask those that have had a smaller pulley put on, what kind of gains have you seen from the pulley swap's? I have been interested in doing this but am going to wait for the stage 2 GM upgrade. So for now, I was just wondering.

 

From a 3,0" pulley on a stock Cobalt SS you should expect a 3 PSI gain, roughly 15 HP and 15 ft-lb torque at max RPM. From a 2,85" pulley you should expect a 5 PSI gain over stock, roughly 25 HP and 25 ft-lb torque. From the PSI-FI kit with a 2,8" pulley, you should expect a 6 PSI gain over stock, roughly 35 HP and 35 ft-lb torque at max RPM.

 

Forget to said in each case you need to disable the solenoid that control the supercharger by-pass valve (past the stock 12 PSI).