I really can't say that I noticed any other improvement...just quicker starting which is nice. I have about 2000 miles on it so far and all is well. I carry a spare though just in case...and a spare belt!
The post said this is the NGK Iridium Plug for the Rhino 660. I believe all the Rhino 660's call for the same Plug. He has a 07 660. You can type in "Iridium Plugs" in the search block on this forum and it will give you lots of Plug info. That's how I found this info. Good Luck.
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