NGK Iridium IX spark plugs are specifically designed for the performance enthusiast. Iridium IX provides outstanding acceleration, high fuel efficiency and durability. NGK Iridium IX plugs offer extreme ignitability and exceptional anti-fouling. Tapered cut ground electrode provides improved starting, idling and throttle response. The Iridium fine wire center electrode's durability is six times harder than platinum. Iridium alloy's extremely high melting point is perfect for today's engines. For even greater performance consider upgrading to an NGK Ruthenium HX plug.
Product Features:
SINGLE IRIDIUM TIP: Fine wire 0.6 millimeter iridium tip center electrode ensures high durability and a consistently stable spark
IRIDIUM ALLOY CENTER ELECTRODE: Iridium's density (6x that of platinum) and extremely high melting point is perfect for modern high efficiency engines
SOLID COPPER CORE: 98% pure copper core offers superior heat dissipation, conductivity and ultra wide heat ranges
TRIVALENT METAL PLATING: Delivers superior anti-corrosion and anti-seizing properties, ensuring ease of installation and removal
RECOMMENDED USAGE: Modified or high performance applications, or as an upgrade to OE nickel alloy spark plugs
Specifications
Center Electrode Core Material:
Copper Core
Center Electrode Tip Material:
Iridium
Electrode Core Material:
Iridium
Electrode Tip Material:
Iridium
Gap Size:
0.044 in
Ground Configuration:
Standard
Ground Electrode Core Material:
Nickel Core
Ground Electrode Quantity:
1
Ground Electrode Tip Design:
Taper Cut
Ground Strap Quantity:
1
Hex Size:
5/8
Manufacturer Heat Range:
7
Reach:
19 mm
Resistor:
Yes
Seat Type:
Gasket
Shorty Spark Plug:
No
Thread Diameter:
14 mm
Tip Configuration:
Solid
Type:
Iridium IX
Wrench Diameter:
5/8 in
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Iridium IX Spark Plug: Single Iridium Fine Wire, BKR5EIX-11
4.8 out of 5
1400 Customer Reviews
96%of respondents would recommend this to a friend
Ratings Distribution
5 Stars
1220
4 Stars
130
3 Stars
21
2 Stars
5
1 Star
24
Pros
249
Improves Engine Efficiency
226
Easy To Install
216
Increases Power
137
Durable
45
Lightweight
Cons
16
none
15
No Improvement In Performance
6
Price
6
None
5
Decreases Gas Mileage
Best Uses
238
Everyday Driving
188
Replacement
149
Performance Driving
53
Restoration
48
Racing
Car & Truck
25
Casual Driver
21
Auto Enthusiast
10
Mechanic
10
Truck Enthusiast
7
Competitive Driver
Describe Yourself
129
Casual Driver
127
Auto Enthusiast
65
Mechanic
34
Truck Enthusiast
23
Competitive Driver
Most Liked Positive Review
Mazda 3s - 2.3L N/A - BEST PLUGS!
Recently replaced the long block assembly on a 2005 Mazda3s Hatchback - this being the 2.3 liter non-turbo. carried over all electronics, ...includings plugs :xUnknowingly cracked spark plug # 4 during the motor swap, causing the car to only run on 3 cylinders.Replaced the plugs with cheap-o BOSCH platinums at $2 and change. And when the sales-teenager girl (at a competing parts store... let's call them [@]) stated that they were pre-gapped (according to her trusty computer), I threw them in the car without even checking.The cylinder misfire in #4 was gone, but now I was getting random misfires... causing excess fuel to blow up in my catalytic converter.. my precious, expensive, need-to-pass-emissions catalytic converter.Did a little research, and well, here's the dillie: Mazda uses IRIDIUM spark plugs from the factory. Nothing else. Mazda also uses NGK SPARK PLUGS from the factory. Nothing else. Mazda specified the SPARK PLUG GAP @ .050. Nothing else.****(This only applies to 2005 - 2009 Mazda3s 2.3L motors. The 2004 Mazda3 2.3L had a different ignition setup).****Anyways, I went out, bought these plugs along with a SPARK PLUG GAP TOOL, RE-GAPPED (they were all at .030, made them .050) and installed these plugs. The car started up immediately. During the delightful 106,990 miles I drove the car before oil-starvation lead to a quite unpleasant rod-knock, the car never started this good.And here's to Advanced Auto Parts being the only place that had these plugs. On a Sunday.Thank you Advanced Auto Parts.Lesson learned: Always check your oil so you don't have to go through what I just did.
Most Liked Negative Review
NGK Iridium
I have a 2003 Nissan Pathfinder LE and I used this kind of plugs. Within 45,000 miles ran the engine produces smoke on the tailpipe. It was a lot of puzzled that arise within me, considering that the NGK company proclaimed as spark plug world leader!When I let the mechanic changed the plugs they showed it to me, the was in bad shape After, with lot of research, I decided to replaced them and bought the Bosch Iridium. I was convinced with this, due to the bosch video that I watched. It was created in a quality wise. And now I have those in in my engine and I'm fully satisfied, with smooth acceleration, quicker response,improved fuel economy and durability. Finally I would conclude that Bosch Iridium is much better than Ngk Iridium, besides Boch is cheaper than NGK.I'm a happy Bosch Iridium user.
Reviewed by 1400 Customers
I will buy these every 50,000 miles
Submitted 2 months ago
Car was running poorly and now has much more power and a smoother running engine
Bottom Line Yes, I would recommend to a friend
Well performing spark plugs
Submitted 2 months ago
These seem to work just fine as a replacement in my 2018 Mazda3 after 92k. I would recommend them as a value over the OEM plugs.
Bottom Line Yes, I would recommend to a friend
I would buy this again
Submitted 2 months ago
Working good so far
Bottom Line Yes, I would recommend to a friend
Doesnt fot as described
Submitted 3 months ago
These plugs 100% do not fit. They are too large. I don't know why they advertise. They are direct fit for a 2007 Infiniti G 35 wasted my time driving to and from the auto parts store which is 30 minutes away only to have to go back and now
Bottom Line No, I would not recommend to a friend
Always performing well
Submitted 3 months ago
I always use NGK no matter what car manufacturer. They always perform excellent and last a very long time. I recommend NGK to all my family and friends.
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Part number 2667 spark plugs, do these fit a 2017 audi a4 quattro
Verified Reply - John the Car-Doc
No, Zach. This NGK Iridium IX Spark Plug: Single Iridium Fine Wire, BKR7EIX - Part # 2667 does not fit your 2017 Audi A4 Quattro 2.0L. However, we do offer an exact fit NGK Ruthenium HX High Ignitability Spark Plug: PSPE Tip Design, LFER7BHX - Part # 95125 for your vehicle online.
I need these plugs for my harley 80 cubic inch motor in a 5/8 plug , do you sell them ?
Verified Reply - Steve
Hi Kevin, I'm glad to help you! We can only look up by the vehicle. Since you didn't mention the specific vehicle, it's hard to tell for sure. To give you the correct information I would need the year, exact sub-model and engine size of the vehicle.
im sorry, wrong part. wanted to know the difference between this part and the 4703 plug. i have a 09 hyundai sante fe 2.7L
Verified Reply - Solomon
Hi Kwadjo, happy to help you! This NGK Iridium IX Spark Plug (Part # 4469) has a gap size of 1.1mm, material of nickel, heat range of 5 and the longevity of 50k miles and the spark plug Part # 4703 has a gap size of 1.0mm, material of platinum, heat range of 16 and the longevity of
100k miles.
2009 hyundai sante fe 2.7L. whats difference between this plug and the 5703 plug that i see is iridium and platinum
Verified Reply - Solomon
Hi Kwadjo, happy to help you! This NGK Iridium IX Spark Plug (LFR5AIX-11) (Part # 4469) has a thread diameter of 14mm, gap size of 1.1mm, resistor value of 5k ohm and the longevity of 50k miles and the part number AI5703 has a thread diameter of 12mm, gap size of 0.7mm, resistor value of 4k Ohm and the longevity of 100k miles.
Does this plug fit buell blast p3
Verified Reply - Steve
Hi Aleck, I'm glad to help you! We can only look up by the vehicle. Since you didn't mention the specific vehicle, it's hard to tell for sure. To give you the correct information I would need the year of the vehicle.
Displaying Question & Answer 1-5
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