What pump / regulator are people using?
I haven't checked into it just yet, but I'd like to step up my fuel supply.

I'm using the Aeromotive 13301.

My car won't be turbo'd until next week but I'm going to use the stock 250 mechanical fuel pump with a boost reference line. For more info I just happen to have made a video.

This should get me to 12PSI or so... we'll see soon enough.

I have a boost referenced mechanical pump right now that works a treat!
Make sure the reference line is a dedicated line! ... I had issues with that.

How do you prevent engine vacuum from going to the pump? Does it have any adverse effects on the pump?

Don't run the line from manifold vacuum. The turbo should have an outlet near the outlet... Use that as your source. That way you get either atmospheric pressure or boost.

Great info thanks! I'm wondering how much boost you're running with your mech pump?

I'm currently at 7 psi.
If you have looked around the forum, you'd probably have seen I was having a fuel issue... This was because I had the reference line tee'd with another. Once I changed to a dedicated line (directly from the turbo), problem solved. I can now hold full throttle as long as I have room for!