The standard, very efficient Mustang radiator was also not good enough for J.D. Reed, who purchased surplus P-51C 42-103757 and had it extensively modified by NAA engineers for racing and record-setting by removing the belly scoop and instead, coolant and oil radiators were located in a large pod on each wingtip.

https://hushkit.net/2022/02/22/10-weirdest-mustangs-bizarre-and-exotic-p-51-variants/