First and only mod on my 2019 ZLE was to swap out the small oem brake deflector with the larger SS unit. Muuuch bigger. And cheap as shit. $37 for the pair. I was sold on this solution even before I bought a Camaro. I know the owner of Vorshlag and he once pointed me to some testing he performed on Mustang cooling options. Net - the brake cooling deflector beat a 4" hose system every time. By and average of 100f.
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https://vorshlag-store.com/products/...-deflector-kit