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does anyone know how to wire a slim fan in? because on the stock radiator fan theres 4 wires going to it but the slim fan only has 2...

never done it before, but if there's only 2 wires then i would presume they are 12v and ground. i would assume the other wires control when the fans come on and off and you would have incorporate them in from your oem fans

so i figured...but i dont have any idea about how to do that? anyone know?

The stock fan has two speeds - that's why there are 4 wires.

Low speed
Black - Ground
Yellow - 12v

High Speed
Red/Black - Ground
Green - 12v

You will probably have to connect the low speed wires to your new fan....

some people just run the wires to a seperate toggle switch inside the car

thanks guys...a toggle switch would be pretty cool...low regular driving high speed on race days =] haha thanks again guys

Personally, I hooked my slimline fans into the high speed wires and used the stock wiring controlled by the stock relay. I live in South Florida so it's pretty much hot all the time. I use Megasquirt to control when they come on and off.

I don't recommend a toggle switch unless you by one with the correct amperage. If the switch isn't rated high enough over time it will get hot and eventually fry itself. Just leave them on the stock relays controlled by the ECU, that should work fine.

Now, if you tapped into the wire from the ECU that triggers the relay and not the high current wires for the fan any old radio shack toggle should work fine.