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Deal.ai › NGK
NGK
NGK Iridium IX Spark Plug (BR8EIX)

NGK Iridium IX Spark Plug (BR8EIX)

4.8(399 ratings)

Best price now

$9.00at Osburn's Family BusinessChecked 35 min ago

32% under what the other stores charge

Compared across 21 stores. Prices are checked against each store and labelled with when.

Visit Osburn's Family Business

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Price facts

  • Lowest price today: $9.00 at Osburn's Family Business (checked Nov 12, 2026).
  • Checked at 21 stores.

Our take on the NGK Iridium IX Spark Plug (BR8EIX)

The NGK Iridium IX BR8EIX is a single resistor spark plug with a fine iridium tip on a copper core, a 14mm thread, 0.75 in. reach and a gasket seat. The iridium center electrode is very hard and thin, which lets it fire consistently with less voltage than a platinum plug. Heat range 8 is a cold plug, so it suits high-revving and modified engines rather than stock commuters. Owners rate it highly for smooth running and long service life; the main caveat is that the cold heat range and single-plug pack mean you must check fitment and buy the right number.

Best forMotorcycles and small engines calling for a BR8EIXModified or high-revving engines that need a colder plugOwners replacing worn plugs with a long-life iridium upgradeTuners matching a specific NGK heat range
Pros
  • Fine iridium tip gives a strong, consistent spark
  • Iridium is harder than platinum, so it wears slowly
  • Copper core conducts heat well
  • Built-in resistor suppresses radio and ECU noise
  • Gasket seat and 13/16 in. hex make installation straightforward
Cons
  • Heat range 8 is cold; wrong for many stock engines
  • Sold as one plug, so a full set means buying several
  • Must verify fitment; not universal
  • Iridium plugs cost more than standard copper plugs

NGK Iridium IX Spark Plug (BR8EIX) prices at every store

  • Osburn's Family BusinessNew

    In stockReturn policy

    $9.00Checked 35 min ago
    Visit Osburn's Family Business
  • MAPerformanceNew

    In stockReturn policy

    $9.40Checked 35 min ago
    Visit MAPerformance
  • NGKNew

    In stock

    $9.40Checked 36 min ago
    Visit NGK
  • RZCrewNew

    In stockPriced in SGD (SGD 16.00)Return policy

    $12.47Checked 35 min ago
    Visit RZCrew
  • Munro IndustriesNew

    In stockShips from Canada · priced in CAD (CA$18.95) · duties may applyReturn policy

    $13.31Checked 35 min ago
    Visit Munro Industries
  • WitchdoctorsNew

    In stockReturn policy

    $14.95Checked 35 min ago
    Visit Witchdoctors
  • SistersMotoNew

    In stockReturn policy

    $14.95Checked 35 min ago
    Visit SistersMoto
  • O'Reilly Auto PartsNew

    In stock

    $14.99Checked 36 min ago
    Visit O'Reilly Auto Parts
  • Munro PowersportsNew

    In stockReturn policy

    $15.00Checked 35 min ago
    Visit Munro Powersports
  • GBPNew

    In stockShips from Canada · duties may applyReturn policy

    $15.00Checked 35 min ago
    Visit GBP
  • FCP EuroNew

    In stock

    $9.39+ $6.99 shippingChecked 36 min ago
    Visit FCP Euro
  • AutoZoneNew

    In stock

    $14.99+ $6.99 shippingChecked 36 min ago
    Visit AutoZone
  • Advance Auto PartsNew

    In stock

    $12.74+ $10.99 shippingChecked 36 min ago
    Visit Advance Auto Parts
  • MotoXshopNew

    In stockShips from Netherlands · priced in EUR (€32.55) · duties may applyReturn policy

    $36.22Checked 35 min ago
    Visit MotoXshop
  • JDMuscleNew

    In stockReturn policy

    $38.00Checked 35 min ago
    Visit JDMuscle
  • Dennis KirkNew

    Availability unknown

    $9.88Checked 36 min ago
    Visit Dennis Kirk
  • AmazonNew

    Availability unknown

    As an Amazon Associate, Deal.ai earns from qualifying purchases.

    $12.86Checked 36 min ago
    Visit Amazon
  • Summit RacingNew

    Availability unknown

    $12.99Checked 36 min ago
    Visit Summit Racing
  • Fleet FarmNew

    Availability unknown

    $12.99Checked 36 min ago
    Visit Fleet Farm
  • RevZilla.comNew

    Availability unknown

    $16.10Checked 36 min ago
    Visit RevZilla.com
  • eBayNew

    Availability unknownSold by bpratv

    $28.89Checked 36 min ago
    Visit eBay

Store links may earn us a commission.

NGK Iridium IX Spark Plug (BR8EIX) price history

Lowest price we've seen: $9.39 on Nov 12 at FCP Euro. Tracked across 11 stores since Nov 12.

What reviewers say

  • 4.8 / 5399 ratings

Rated 4.8 out of 5 across 399 ratings. Owners report easy starting, smooth idle and steady performance, and many praise the long service life. Complaints are few and mostly about ordering the wrong heat range or receiving a single plug.

What people mention
  • PerformancePraisedOwners say the engine runs smoother and starts more easily after fitting.
  • DurabilityPraisedReviewers report the plugs hold up well over long mileage.
  • ValuePraisedBuyers consider the iridium plug worth the extra over standard plugs.
  • Heat rangeMixedSome buyers find heat range 8 too cold for their engine and had to swap it.
  • Pack sizeCriticisedSome were surprised it is a single plug rather than a set.

About the NGK Iridium IX Spark Plug (BR8EIX)

The NGK Iridium IX (BR8EIX) is a resistor spark plug with an iridium tip. Its ultra-fine center electrode is made thick enough for durability and long life, and thin enough to produce an accurate, consistent spark.

Iridium is the hardest metal used in spark plugs. It is six times harder than platinum, which allowed NGK engineers to reduce the voltage needed to create a spark. The center electrode has a copper core.

Heat range
8
Tip material
Iridium
Core material
Copper
Resistor
Yes
Insulator type
Non-projected
Thread size
14 mm
Reach
0.750 in.
Seat style
Gasket
Wrench size
13/16 in.
Ground straps
One
Shorty plug
No
Fitment
Fits many vehicles; verify fitment for your application
In the box
1 spark plug

Questions and answers

Is the BR8EIX a direct replacement for a BR8ES?
It uses the same 14mm thread, 0.75 in. reach and gasket seat, and the same heat range 8, so it fits the same applications. The iridium tip is the main difference.
Is heat range 8 right for my engine?
Heat range 8 is a cold plug, suited to high-revving or modified engines. A stock engine often calls for a hotter plug, so check the manufacturer's spec.
How many plugs come in the box?
One spark plug. A multi-cylinder engine needs one per cylinder, so order the number you need.
Does it need gapping before installation?
NGK sets the gap at the factory. Check it against your engine's spec and adjust only if needed, using a gap tool that won't damage the fine iridium tip.
Does the resistor matter?
Yes. The built-in resistor suppresses electrical noise that can interfere with radios and engine electronics, which matters on modern vehicles.
How often should it be replaced?
Iridium plugs last far longer than copper plugs, but follow your owner's manual interval. Inspect the plug if the engine starts misfiring or idling roughly.
Where is the NGK Iridium IX Spark Plug (BR8EIX) cheapest?
At Osburn's Family Business, for $9.00, 32% under what the other stores charge, as of our latest check.
What do buyers say about the NGK Iridium IX Spark Plug (BR8EIX)?
Rated 4.8 out of 5 from 399 ratings.
Where can I buy the NGK Iridium IX Spark Plug (BR8EIX)?
21 stores we checked sell it, including MAPerformance, RZCrew, JDMuscle, Munro Industries, Munro Powersports.

Stores we've priced the NGK Iridium IX Spark Plug (BR8EIX) at

  • Fleet Farm deals and prices

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