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Deal.ai › NGK

NGK

NGK Iridium Spark Plugs Box of 4 (BKR7EIX)

NGK Iridium Spark Plugs Box of 4 (BKR7EIX)

Best price now

$34.33at K Series PartsChecked 9 h ago

18% under what the other stores charge

Compared across 14 stores. Prices are checked against each store and labelled with when.

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Price facts

Lowest price today: $34.33 at K Series Parts (checked Nov 13, 2026).
Checked at 14 stores.

Our take on the NGK Iridium Spark Plugs Box of 4 (BKR7EIX)

The NGK Iridium IX BKR7EIX is a set of four iridium-tipped spark plugs aimed at performance-minded drivers. The fine-wire iridium center electrode and tapered cut ground electrode are built for strong ignitability, easy starting and sharp throttle response, and NGK rates the iridium tip as six times harder than platinum with a high melting point for heat resistance. Against standard copper or platinum plugs it trades a higher cost for longer service life and better fouling resistance; NGK itself points buyers wanting more to its Ruthenium HX line. It suits tuned and turbocharged engines and drivers who want a durable plug, but the heat range must match the engine.

Best forPerformance and tuned enginesTurbocharged and high-compression carsDrivers wanting long plug service lifeOwners replacing plugs on the listed vehicles

Pros

Iridium fine-wire center electrode for strong ignitability
Tapered cut ground electrode aids starting and throttle response
Iridium tip rated six times harder than platinum
High melting point resists heat in modern engines
Good anti-fouling behavior

Cons

Costs more than copper or standard platinum plugs
Fixed heat range must match the engine; wrong grade risks misfires
Gap should be checked before install
Not the top of NGK's range; Ruthenium HX sits above it

NGK Iridium Spark Plugs Box of 4 (BKR7EIX) prices at every store

WalmartNew
In stockSold by Daichi
$48.70Free shippingChecked 9 h ago
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BNRNew
In stock
$49.99Free shippingChecked 9 h ago
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eBayNew
In stock
$50.00Free shippingChecked 9 h ago
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K Series PartsNew
Availability unknown
$34.33Checked 9 h ago
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Turn In ConceptsNew
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$34.33Checked 9 h ago
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UroTuningNew
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$34.96Checked 9 h ago
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$35.47Free shippingChecked 9 h ago
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Touge FactoryNew
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$37.00Checked 9 h ago
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MAPerformanceNew
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$37.60Checked 9 h ago
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SMY PerformanceNew
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$38.96Checked 9 h ago
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Jackson RacingNew
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$42.00Checked 9 h ago
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ECS TuningNew
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$55.99Checked 9 h ago
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RAD IndustriesNew
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$56.04Checked 9 h ago
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Circuit HeroNew
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$106.54Checked 9 h ago
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NGK Iridium Spark Plugs Box of 4 (BKR7EIX) price history

Lowest price we've seen: $34.33 on Nov 13 at Turn In Concepts. Tracked across 14 stores since Nov 13.

What reviewers say

Owners of turbocharged and tuned cars commonly fit these as a durable upgrade over stock plugs and report smooth idle and clean running. Some note the higher cost and the need to confirm the correct heat range and gap before installing.

What people mention

Ignition and idlePraisedOwners report smoother idle and cleaner running after switching to these plugs.
DurabilityPraisedDrivers say the iridium tip lasts far longer than standard copper plugs.
Turbo usePraisedUsed widely in turbocharged and tuned engines with good results.
CostCriticisedSome buyers find them expensive next to ordinary plugs.
Heat rangeMixedBuyers note the grade must match the engine or running suffers.
GappingMixedA few say the gap should be checked and set before fitting.

About the NGK Iridium Spark Plugs Box of 4 (BKR7EIX)

NGK Iridium IX spark plugs come in a box of 4, part number BKR7EIX. They have an iridium fine wire center electrode, which is six times harder than platinum. Iridium alloy also has a very high melting point.

The ground electrode has a tapered cut, which improves starting, idling and throttle response. The plugs are built for easy ignition and resistance to fouling, and for acceleration, fuel efficiency and durability.

Brand: NGK
Series: Iridium IX
Part number: BKR7EIX
Quantity: Box of 4 spark plugs
Center electrode: Iridium fine wire
Ground electrode: Tapered cut
Audi fitment: Select 200 Quattro, A3, A4, A5, A6, allroad, Q3, Q5, R8, RS5, RS6, S4, S6, TT and TTS models, 1991-2018
Other fitment: Aston Martin DB7 (1997-1998); BMW Alpina B7 (2007-2008); select Polaris ACE 500, Frontier, FS and FST models

Questions and answers

Are these better than standard copper plugs?: Yes for durability and fouling resistance. The iridium tip is rated six times harder than platinum and handles heat better, so it lasts longer, at a higher cost.
Do I need to gap them before installing?: NGK sets a factory gap, but it is worth checking against your engine's spec, since handling in transit can alter it.
Will they fit my car?: BKR7EIX fits many Audi, Aston Martin and other applications listed by NGK, but confirm the part number for your exact year, model and engine before buying.
Should I choose Ruthenium HX instead?: NGK positions Ruthenium HX above Iridium IX for greater performance. Iridium IX remains a solid choice for most tuned and stock engines.
How many plugs come in the box?: Four plugs, enough for a four-cylinder engine; six- and eight-cylinder engines need more than one box.
Are they pre-gapped for my engine?: They come with a set gap, but the correct gap depends on your engine, so verify it before installation.
Where is the NGK Iridium Spark Plugs Box of 4 (BKR7EIX) cheapest?: At K Series Parts, for $34.33, 18% under what the other stores charge, as of our latest check.
What do buyers say about the NGK Iridium Spark Plugs Box of 4 (BKR7EIX)?: Rated 5 out of 5 from 1 ratings.
Where can I buy the NGK Iridium Spark Plugs Box of 4 (BKR7EIX)?: 15 stores we checked sell it, including K Series Parts, Amazon, Turn In Concepts, UroTuning, Touge Factory.

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