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  1. Engine / Airbox / Exhaust / Fuel Delivery
    Can anyone please explain the difference between spark plugs IMR9C-9H, IMR9A-9H, and IMR9C-9HES? Also found something called BRISK 360° plugs, they look a bit different. Any good? I did actually search and read NGK's website but couldn't find this info. Åke
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