I'm running 350bhp+ and still using the original Radiator, there's no electric booster pump, just using the normal engines pump.
To make the cooling worse, i've even stuck a big AC condenser and charge cooler radiator infront of the main rad and my water temp still holds nicely below 90, and that's currently only with one fan wired up.
When I had the Honda engine, I never had any temp issues either, you don't need the slots underneath, you don't need an electric pump.
Ed.
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