You can never go to big on your fuel system, especially when your going to be dealing with forced induction. I recommend the Walbro GSS340 fuel pump. It's a 255 high pressure pump. The only thing I'm not certain about is how it would do right now with you NA, as they were ment for forced induction applications and I've never tried one on a NA car. Be careful, they make two 255 pumps, one high pressure(the 340), and another regular pressure that won't support near the hp your probably looking at with your current setup and a supercharger added.
After going back and looking at your sig again, your also going to need an inline pump, such as a T-rex to go along with the 255 in-tank pump. Your also going to need to upgrade injectors again, minimum 30's with an fmu, but I would look at 38's or 42's with no fmu.
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91 single turbo vert
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