Originally Posted by kytc

You don't need it because with the new pulley the a/f ratios are perfect. I asked about this too when I got my s/c put on and they said it wouldn't really help. Now if you put an emanage or something on after the pulley you might squeak a little bit more out but not much until you put something like an intake on it or bump up the boost some more. However, if you did something like tweaked the timing some or whatever with the emanage it would probably be beneficial however you won't get the a/f ratios any better than they are with the 9 psi pulley and the s/c with a reflash.