I have an 05 cobalt ss.sc with a good amount of mods. I wanna get the stage 2 kit from smoothpulleys. it like 90$ for the hub, pulley, hardware, and allen key. What is the limit I can decrease in pully size and still keep my stock injectors and ecu setup? I wanna do around 3.0 but let me know how low I can go and what upgrades will have to be done the lwoer you go..thanks

 

Stay stock until you have the ability to upgrade the injectors and tune at the same time.

 

From reading here it seems as if the stock injectors are almost maxxed out from the start... so you're not going to to any good until you get the 42's.