If you let the car overheat you will have head cooling problems. My stock cooling system does just fine on 90+ degree days in traffic. How are the natural 603's on power? I really like the turbo on mine it really starts to move over 3k rpm.

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2016 Corvette Stingray 2LT
1969 280SE
2023 Ram 1500
2007 Tiara 3200