I have a question see if ya guys can help me out i have a 08 gmc sierra wit servo shift kit 4.10 posi headers ported throttle body and cai i still don wanna add the cam and stall can i add a pulley ? Wat do ya suggest to go alittle faster

 

You can get a tune and that will help

 

long or short tube headers? if shorties, long tubes will be an improvement. a tune will definitely help wake it up, especially if you're still running stock tune with headers and throttle body.