I personally think you'll be fine with OEM feed as the return. Works fine in my car, brought my duty cycle down significantly, and I'm still running 1000cc injectors.
What power do you manage on that? I'm currently pretty much maxing my duty at 460fw/bhp with no return
The oem feed is pretty much AN4 and if that can feed the car no issue I'm sure it will be able to return unspent fuel without much trouble?
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