Well after dropping fuel pressure on the dyno im thinking of putting the stock pump back in the tank with the 255 that i have in there and have the stock pump activate via a hobbs switch at a certain boost level.
here is my setup
96 gas tank
vette fuel filter/regulator
stock ls1 lines
stock wiring
reading 12 volts on the dyno pull but lost 10-20 psi of pressure as soon as boost hits. the pump is getting tested right now. i am thinking of using the stock pump because i already have it and this car will be lucky to see over 500 wheel hp with forced induction.

 

If you have a 255 in the tank & it is dropping pressure with 500rwhp, you have other problems to find first. A good 255 will easily support 550rwhp.

 

thats what i thought. some people say it could be the vette filter/regulator?

 

thats what i thought. i wonder about the vette filter with the built in regulator?

 

The Vette fuel system is typically capable of 650+rwhp, so your setup should be similar.