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The Z06/Z51 cars have the finned heat exchangers because those options were for made the auto-x/road course folks where heavy and constant steering use is present. The finned version has the ability to transfer more heat out the fluid and into the air.
From: Piedmont, SC Currently Own: 99 Nassau blue FRC. Previously Owned: 84,95,98 Indy Pace,01 Z06
Thanks! I was figuring that the finned one had to be for a z06 or something. I purchased a front cradle and it already had this cooler on it with no fins and I had this one with the fins and was wondering.