cooling

You gotta remember the coolant entering the engine from the rad should be 40, 50*s or more.. cooler than the coolant leaving the engine,, so by sucking warm coolant from the bypass, I would think, helps mitigate the "shock" of cold water entering the engine.. (just thunkin here)

I believe the bypass also gives the coolant somewhere to go at hi rpm with a partially open stat..

nm9.. I better go do it now before I forget.. lol .. thnx