You can get more out of the stock pumps for sure. For starters you can adjust the AFC on the top of the pump for earlier boost fueling. This doesn't give you any more than you would be getting, but it brings it on a lower boost pressures so you get better turbo/throttle response. You can find videos of people doing this on YouTube, it's a pretty easy think to do on your own. You can also try to advance the pump timing a little bit. Factory injection timing on these motors is something like 5* after top dead center, bumping that up a few degrees again helps with throttle response and gives a little boost in power, just don't advance it too far or you'll lose power and possibly hurt something. Again, there are videos inline for this. The other option for a stock pump is to adjust the full fuel screw, but this is risky as it can cause a runaway if you aren't careful. It isn't hard to do, but it can be hard to adjust it properly. I would try the other things first and then maybe do this. The stock pumps can handle a decent amount of air before this is necessary, if you start getting crazy with it you will want to upgrade the pump itself though.