You can run the stock low voltage with a high voltage circuit triggered by the stock wiring which should allow the stock FPR to be used, I've read a couple times people using the stock regulator with the 450 on the stock wiring.

6th post down.
https://www.evolutionm.net/forums/ev...circuit-5.html

The only drawback is that there is a glitch where if you turn the key off and back on rapidly, the pump will stay running. This is easily avoided and if it does happen just start the car up and let it run for a minute and it will fix itself.

 

I have stock lines, stock fpr, no drilled out siphon and it's rewired at 460ish wheelw

Fuel rail pressure is high but works.

I went through 3 aeromotive 340s and this thing has been the most reliable.

 

Nice! Even easier solution for the high/low voltage setup. The more simple the better. Btw I have a aeromotive 340 laying around and after reading all the posts with them failing on e85 I have decided to stay away.

 

FIC 2150cc, Adjustable FPR, Base pressure at 35psi, Punched down Walbro 255hp, I made 565whp on a DJ. At 21psi on a FP3586. As long as the boost is low there will be lots of flow.