NGK CR9EIX - Iridium IX Spark Plug - 4-Pack -

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    "Manufacturer Part Number": "‎CR9EIX",
    "Position": "‎Front, Rear",
    "ASIN": "B004SKYAWM",
    "Customer Reviews": "4.8 4.8 out of 5 stars (495) 4.8 out of 5 stars",
    "Best Sellers Rank": "#12,033 in Automotive ( See Top 100 in Automotive ) #57 in Automotive Replacement Spark Plugs",
    "Date First Available": "April 10, 2012"
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    "items": [
      {
        "title": "5.0 out of 5 stars GOOD PRODUCT",
        "body": "VALUE WAS GREAT FOR QUALITY. FIT WAS PERFECT START WAS RIGHT ON. POWER WAS IMPROVED. DURABLE AS IT SHOULD BE Read more",
        "author": "Michael Y.",
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        "date": "February 20, 2026",
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        "body": "Great price for these quality spark plugs. My bike is running better! Read more",
        "author": "Dianne S.",
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        "title": "5.0 out of 5 stars Great plugs",
        "body": "I installed these in my 2021 Indian Scout Bobber ABS. I can see the improvement over the regular plugs. The bike starts better and runs better at idle and full throttle. I recommend them. Read more",
        "author": "Bill",
        "rating": 5,
        "date": "October 15, 2025",
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      {
        "title": "5.0 out of 5 stars Great product, great price, great company",
        "body": "Great!! Can’t go wrong! Read more",
        "author": "Jae",
        "rating": 5,
        "date": "December 1, 2025",
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        "title": "5.0 out of 5 stars Dealer performance without the dealer price",
        "body": "NGK CR9EIX Iridium IX Spark Plug – 4 Pack Installed these in my bike and it fired right up with no skips or hesitation. These appear to be very comparable to the much more expensive Screamin’ Eagle plugs sold by Harley. Looking at them side by side, they seem to be essentially the same plug with different branding. They come with a preset gap, which is a nice plus. Of course my OCD still requires me to check them anyway, but all four were spot on and didn’t need any adjustment. I can’t speak yet to long-term durability, but NGK has a strong reputation and I expect them to hold up well. For reference, these were installed in a 2019 Harley-Davidson Softail 114. Overall, a great value compared to the dealer-branded option. Read more",
        "author": "CmfmotorSports",
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        "date": "March 10, 2026",
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      {
        "title": "5.0 out of 5 stars Muy buena calidad, lo recomiendo",
        "body": "Muy bueno el producto lo recomiendo Read more",
        "author": "Raidel",
        "rating": 5,
        "date": "March 14, 2026",
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      {
        "title": "5.0 out of 5 stars Harley Plugs",
        "body": "Bike seems to idle & run better Read more",
        "author": "Bubba Byars",
        "rating": 5,
        "date": "February 3, 2026",
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      {
        "title": "4.0 out of 5 stars As described",
        "body": "As advertised Read more",
        "author": "44sal",
        "rating": 4,
        "date": "August 23, 2025",
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  "about_this_item": "Buy NGK CR9EIX - Iridium IX Spark Plug - 4-Pack/-: Spark Plugs - .com ✓ FREE DELIVERY possible on eligible purchases 4 pack NGK Iridium IX 3521 Spark Plug; Genuine NGK Parts; Includes original packaging and hardware; Direct replacement auto parts; Confirm vehicle fitment with Confirmed Fit Rated 4.8 out of 5. Customers find these spark plugs to be of good quality, with one mentioning they're the best plugs for the M8 Harley. Customers like the throttle response, with one mentioning improved performance at both idle and full throttle.",
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