Lots of gas.

Single GSS340 pump, 42's, stock lines,rails, ect..

Im over 500 horse ( 600+ flywheel horse)
and have yet to push the lines/rails..
A/F ratio was from 8.0-8.5 at peak.

Defintaly not maxed out..
although its turbocharged, and i dont have to rev the piss out of it
 
The rails are good for 600hp, the fuel lines however create a supply problem with bigger injectors such as 42lb or bigger. Anything bigger than 42lb you should get bigger rails b/c a bigger injector will dry out a stock rail.

Troy