Originally Posted by bri3d

You won't get any more HP unless you have an SRT6, a pretty big pulley, and tune it.

The stock fuel pumps on the SRT6 and N/A are more than adequate for any stock applications - with a big pulley, the SRT6 will start to go lean at the top-end and you need a tune and a fuel pump to even it out, but a fuel pump alone won't help you much.