this may apply to all atvs so i didnt want to put it in one particular section.. (700, 660, 350, etc). I saw on powerblock tv today where they dynoed a 383 stroker i believe with 2 different sets of plugs. They gained 5.5 hp just by changing the plugs. Since this is true can the myth be broken about the eix (iridium plug) not making anymore hp and or making a less "brake specific fuel consumption"...(the better plugs used slightly less fuel.)