Ive not heard any complaints from people about the 4306. I know others use different plugs. The 4306 is just the most common plug. By the way are the ones you are refering to the ones that have some special pattern on them that you have to buy the spark plug tool from them to install? I cant remember which plug it was, but it was a step colder than the 4306 and there was something about it that caused normal spark plug sockets to not work. In general, for most people running nitrous, the 4306 will be all you need. If you are stage 3, large turbo, etc you may need a colder plug. I am working on a write up about reading plugs. In it will be a long and somewhat technical description of plug heat ranges, how to figure the range you need, and how to read the plug itself. It will include probably over 50 pictures though for those who dont like to read.
Hayabusa
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