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Depends on your location and driving style, I'd imagine. I always use a shroud in combination with the mechanical fan. They are both required components of an air-moving system.
That being said, if you have a higher capacity aluminum rad and your climate + use are mild, you are probably ok, but without peace of mind.
My educated guesses, if using clutch fan w/ no shroud:
>Traffic jam in Arizona? Overheat
>Any type of track driving? Overheat
>Rural daily in New York? Probably ok
>Daily driver pretty much anywhere without traffic looking like a bozo with no front bumper? Probably ok
KA shrouds are pretty hard to find these days unfortunately. I may have one I'd be willing to offload if it helps out a forum member. I have also retrofitted SR20 shrouds (still available from Nissan for pretty cheap) to work on KA's as well.
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