My biggest cooling gains came from ducting. The fallow air in the fenders impaired the capabilities of even a pair of good oil coolers.
A high-volume fan (like the 964 2-speed fan, set at the higher speed), and even a later-style cooler from a 964 or 993 (if you can find the room) is a good idea. David Griswold has had good success with these.
But ducting -- a clear path in, no way for the air to go but through the cooler, and then a clear path out -- makes the difference at speed.
No amount of air is too great:
I consider my car to be a cool-air vacuum with an engine attached.
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Jack Olsen
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[This message has been edited by JackOlsen (edited 10-18-2001).]