There has been a couple of threads on this on here already. Search the polaris forum and performance modified.
I'm sure they work as good as any other plug, but I wouldn't expect anything special from them. When they claim HP gains, testing is usually done on older equipment or something that wasn't running correctly. This way it shows a noted improvement. We have just seen too many of these products over the years. And now with the economy the way it is companies will be claiming hp and fuel economy increases on every little gimmik. Trying to get you to part with your hard earned $$.
I personally haven't tried them. Sorry if I sound like a negative Nancy, but remember splitfire plugs? They may help give a more complete burn, but I doubt you would notice it. Modern motors and plugs are designed to give a pretty complete burn from the get go.
