Well ive decided to just get my catback and wait till i get the money for headers but i was thinking of adding a y pipe with the catback (magnaflow) and spend a couple extra buck. Will the y pipe make a difference even though i have stock headers on?? If it does what differences and is the sound louder?

 

It will make a difference, the stock Y pipe is known for being extremely restrictive(once you get it off you'll see why). Even with the stock manifolds upgrading the Y pipe is a good step, it'll probably get you more than getting just headers. I don't know about sound, but I'd assume that it'd get louder, but probably not by much.

 

You might as well do it all at once and save some hassle....

Headers, ypipe, cat, spipe, and catback...