www.rhdjapan.com tell them rice racing sent you. They supply me all my Greddy spark plugs, of which I have sold probably 1000 or more lol. In that time never ever had one plug problem, hence I have stuck with them as my main type I recommend.



I am trialing other brands, but until I get the required number tested in various platforms and amount of distance covered I cant put my stamp of approval on them