I've got the Koyo N-Flow in my car and I'm using a stock radiator cap on it. (Actually, I'm pretty sure it's an OEM equivalent from an auto parts store, but it wasn't a Koyo specific cap.)
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2004 RX8 GT
1986 RX7 Track Car: 13B Bridge Port w/ Renesis Internals and Weber Carb
2003 MazdaSpeed Protege
1988 RX7 Convertible - new project
2004 Impreza and 2003 Legacy wagons for hauling groceries and The Dog
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