[COBRA427]

Here's what I'm doing:

My motor is an all aluminum LS-6. I originally planned on replacing my stock mechanical pump with a Mezeire electric one (55gpm). One concern I was having was cold weather start up. It's true, you would need to have that electric pump running all the time or face having hot spots at critical areas of your engine, which is not even a good thing. So, during cold climates, it would take longer to warm up your engine.

This is what I've decided is the best approach. I'm keeping the stock pump, and will install an electric booster pump from Stewart. The new pump is installed in between the radiator, lower hose, and the stock mechanical water pump. Stewart does not recommend using an electric pump as your primary pump. Even a mechanical pump at higher rpm's will out flow an electric one.
Here is what I see are the advantages of using 2 different pumps:

1. Your motor warms up as it normally does,as the electric one is not turned on nor needed at this time.
2. Whenever encountering heavy traffic and the temp starts to climb, hit the booster pump. Stewart claims at 750rpm idle, the electric pump will flow 300% more water thru the motor than the mechanical one, thus lowering your coolant temp.
3. After Autocrossing and waiting for your next turn, you can shut your motor off, and just run the booster pump and electric fan to cool down the motor.
My 2 cents.
Ed