I have an MGT 4.60 and I want to know which plug to use. I prefer O.S. plugs, but could use McCoys also. I run 20% fuel and am just a serious basher. I have been told to use both the OS #8 (medium hot) and the OS A-5 (medium cold) by different people. Which would be best for my application and also which McCoys would a lot of you use? Thanks for any suggestions.