Can u put a smaller gm pulley on the stock pulley mounts? If I do get a smaller pulley do I have to upgrade my software in the car?

 

If your car is stock now then no and yes youll need a reflash. I recomend zzp stage 2 kit.

 

the stock pulley is pressed on. any other pulley must have a bolt on multiple pulley system on the snout before you can put on any pulley other than stock.


and honestly ALL this has been covered a billion times. please search for anything you need to find. use google, it works better.