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I've got the 044 bosch pump on the race car @ 50psi on 750cc injectors and it's both quiet and capable. I've got a -8 feed line from the tank to the pump, -6 high pressure out to a filter, then -6 to the motor. I'm also running a -6 return back to the tank to make things easy.
You could probably get away with using -8 from tank to swirl pot, -8 from swirl pot to pump, and then -6 for the rest of the system like I did with out issue. It's only when you get into truly ridiculous hp numbers and 1000cc injectors that you will need anything more than a -6 feed line.
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