I suppose you are talking about the 03 Cobra Tank and dual pump set up? Not sure how much it can handle but I have a friend with a 01 Cobra and built Motor with about 630HP.
I believe he is also running a Kenne Belle Boost a Pump (Voltage Booster) along with that set up. So I guess with the proper tune the 03 set up should be able to handle around 600 HP.
Anything more and I think swapping to a return style system would be a wise choice.
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