I had to use a standard radiator cap because of steam escaping from one of the Mishimoto's. Apparently there are several forums throwing Mishimoto caps out of the box.
π§ Improved Stant 10230 Radiator Cap for Effective Engine Cooling
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Mishimoto MMRAD-WRA-87 Performance Aluminum Radiator for Jeep Wrangler YJ/TJ 1997-2006: Enhance Cooling Efficiency and Performance
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π₯ Enhance Performance with Derale 13950 Atomic-Cool Remote Cooler, Black
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CPU cooler Deepcool GAMMAXX S40, black
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