Stock, 190, or 255?

[usmc0651dns]

I am looking to run 20 - 25 PSI on my 18g with 660 injectors. I have the stock fuel pump currently. Should I upgrade to the Walbro 190 or 255?

 

[BLINKY619]

ok first thing's first... do you have a afpr? if not then the 255 will overrun your stock one... the 190 will be fine, but keep in mind that if you have more goals down the road for making more power then you should think about getting the 255 (but remember that to run the 255 you will need a afpr) also 20-25 psi is doable but you'd be better off with supporting mods (if not equipped)