yea i installed a injen cold air intake and a apex n1 exhaust but im not to sure if i should put headers or not because i not too sure

 

I'd wait on the header. If you put the stock up against an aftermarket one, the piping is pretty much the same size...Get a set of pullies "AEM" As of matter of fact, I have a set that I've been trying to sell, only for $80, so if you're interested, e-mail me romanticpimp@hotmail.com