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Since you have the radium hanger w/ different options for the saddle siphon, I believe you are looking for the answers to these questions:
  • Can a Walbro 450 run on the OEM wiring circuit
    • Will a Walbro 450's current draw fry the OEM wires
    • Can a Walbro 450 be ran on 9V (I'm assuming Evo's OEM setup is not PWM)
Since the Radium unit is designed to help with larger pumps (among other things), if you hardwire the 450, I'm guessing they have a fitting that will work. You'd have to ask them or search to know which one.

I don't have the answers to the above memorized, but that should help with your search.

It might also be worth looking into a Fuel Pump Controller...if you want to try and keep the return flow more consistent across the rpm/load range.
 

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The hanger makes it easy to hardwire up to 2 pumps, if needed. Agree with, ask your tuner. I'd say if it's not hard driven you can get away with stock wires but its a cheap buy for a rewire kit to not deal with any potential small gauge wire issues. You already got a pricy hanger, just another $40 for a Deatschwerks rewire kit.
 
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