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Columbus, OH 43205
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NGK Iridium IX Spark Plug: Single Iridium Fine Wire, DR8EIX

Part # 6681
60 day replacement if defective
$11.99
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Product Information

Product Details
Part No. 6681
Warranty Details (60 DAY REPLACEMENT IF DEFECTIVE)
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
  • TAPERED CUT GROUND ELECTRODE: Reduced quenching design produces outstanding ignitability, improved acceleration, fuel efficiency and durability
  • 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:
0.032 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:
18

Manufacturer Heat Range:
8

Reach:
19 mm

Resistor:
Yes

Seat Type:
Gasket

Shorty Spark Plug:
No

Thread Diameter:
12 mm

Tip Configuration:
Stud

Type:
Iridium IX

Wrench Diameter:
18.00 mm

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4.8 out of 5
1403 Customer Reviews
96% of respondents would recommend this to a friend
Ratings Distribution
5 Stars
1223
4 Stars
130
3 Stars
21
2 Stars
5
1 Star
24
Very pleasedDefinitely recommendLike the Iridium sparp plugs.
They workOMG so good in my Suzuki bought same brand for my Corvette !OMG so good in my Suzuki bought same brand for my Corvette !Iridium ix spark plugsSparks will fly
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 1403 Customers
I would buy this product again
Submitted 2 months ago
Fit and performance was prefect.
Bottom Line Yes, I would recommend to a friend
Good Spark Plugs
Submitted 2 months ago
Spark plugs gapped and ready to install. Been using them for a few weeks and right after install went on 400 mile round trip. No issues at all.
Bottom Line Yes, I would recommend to a friend
Perfect for Subaru
Submitted 2 months ago
Restored engine to working order.
Bottom Line Yes, I would recommend to a friend
I will buy these every 50,000 miles
Submitted 3 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 3 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
Displaying Reviews 1 - 5Back to Top

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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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