when putting in the 9lb pulley for the vortech do I have to up grade anything ....car don't run right.....

 

I edited your topic title to be more descriptive. "need help" doesn't say much about your problem.

That said, you'll be needing some type of additional fuel management, be it a AEM EMS, E-manage and bigger injectors.

 

i just had my 9psi pulley put on, along with the 550 injectors and AEM EMS. IMO the car runs better than stock now.

 

thank you