1205 E Main St
Columbus, OH 43205
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Product Information

Product Details
Part No. 5349
Warranty Details (1 YR REPLACEMENT IF DEFECTIVE)
Increased performance with World's smallest Iridium Center Eletrode (0.4mm).

Product Features:
  • World's smallest Iridium Center Electrode (0.4mm) for improved spark for maximum combustion
  • Patented 360-degree laser welding assembly process
  • U-groove and taper cut ground electrode to maximize flame propagation.
  • Withstands temperatures greater than 4000 Fahrenheit
  • Burnished nickel plating for high temperature endurance and superior corrosion resistance
  • Wide range of part numbers for thousands of applications, including classic and collector cars
  • Iridium Power
  • Superior Performance: This spark plug requires 5,000 volts less to fire compared to conventional spark plugs, providing maximum performance even under extreme conditions.
  • Enhanced Horsepower and Efficiency: Enjoy more horsepower, faster and easier starts, fewer misfires under heavy loads, and better fuel efficiency with the DENSO Iridium Power spark plug.
  • Patented Iridium Technology: The patented technology of the Iridium Power plug ensures it outperforms any other spark plug available today.
  • Tapered Seat Type: Designed with a tapered seat type for optimal fit and performance in your engine.
Specifications
Center Electrode Core Material:
Copper

Center Electrode Tip Material:
Iridium

Ground Configuration:
Standard

Ground Electrode Core Material:
Nickel

Ground Electrode Quantity:
1

Ground Electrode Tip Design:
Tapercut, U-Groove

Hex Size:
16.0 mm

Pre-Gap Size:
1.1 mm

Resistance:
5000.0

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4.65 out of 5
345 Customer Reviews
89% of respondents would recommend this to a friend
Ratings Distribution
5 Stars
286
4 Stars
33
3 Stars
5
2 Stars
7
1 Star
14
Denso does not replace AC Delco 41-125 OEM plugsBuyer bewareWould definitely purchase again.
Pros
41
Improves Engine Efficiency
34
Increases Power
32
Easy To Install
19
Durable
7
Lightweight
Cons
3
none
2
Decreases Gas Mileage
2
No Improvement In Performance
1
Difficult To Install
1
It Is Gapped At
Best Uses
40
Everyday Driving
26
Replacement
22
Performance Driving
7
Racing
5
Restoration
Car & Truck
10
Casual Driver
9
Auto Enthusiast
4
Mechanic
3
Competitive Driver
3
Truck Enthusiast
Describe Yourself
14
Auto Enthusiast
13
Casual Driver
9
Mechanic
4
Competitive Driver
1
Truck Enthusiast
Most Liked Positive Review
Go Denso
These plugs made my cobra mustang run alot better so I tried them in my everyday driver 05 Focus and now it runs alot better also. Just be sure and gap them at factory specs.I am suprised that they perform that much better than the NGK Iridiums that came stock! You will not be disappointed.
Most Liked Negative Review
Great in the beginning
I bought these plugs for a Pontiac G6 GT to liven it up. In the beginning they were great with a large difference in acceleration. However within 700 miles on the plugs this performance increase started to dive downward. My gas mileage went from 25 mpg to somewhere around 16 mpg with only about 2000 miles on the plugs. I currently am looking on the site for the stock delco part number to get my gas mileage and performance back. Right now with 2500 miles on the plugs my car has a rough idle, which will be gone once the Denso's are out! (Use them for race day and then take them out and reinstall your factory ones) For the price they are per plug they should last more than 2500 miles.
Reviewed by 345 Customers
223 sitton rd
Submitted 6 months ago
great
Bottom Line Yes, I would recommend to a friend
2920 Ridgepine Drive
Submitted 7 months ago
right part first - time - car runs better with the refreshed plugs
Bottom Line Yes, I would recommend to a friend
What can I say
Submitted 7 months ago
They fit in my k20a3 engine
Bottom Line Yes, I would recommend to a friend
Fixed my rough runner
Submitted 7 months ago
Engine purrs like a kitten again!
Bottom Line Yes, I would recommend to a friend
These plugs are what was supposed to be in my vehicle. Thank
Submitted a year ago
Like the headline said, these are the ones that are supposed to be in my vehicle and they worked fine
Bottom Line Yes, I would recommend to a friend
Displaying Reviews 1 - 5Back to Top

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Will it fit a 2007 ford f150 xlt 5.4
Verified Reply - John the Car-Doc
No, Tim James. This Front Lower Control Arm Bushing Kit - Part # DW-K304B does not fit your 2007 Ford F-150 XLT 5.4L. However, we do offer an exact fit MOOG Front Lower Control Arm Bushing Kit - Part # K200365 for your vehicle online.
Do these plugs require a 5/8" spark plug socket?
Verified Reply - John the Car-Doc
Yes, Dustin! This DENSO Spark Plug Iridium Power - Part # 5353 will require a 5/8"-inch (16mm) hex socket.
Hi I need axle bushing for the upper rear control arm,is this it
Verified Reply - John the Car-Doc
Hi Jimruggio! 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, make, model, and wheel drive type of the vehicle.
2009 hyundai sante fe 2.7L. whats difference between this plus and NGKIridium IX Spark Plug (LFR5AIX-11) part 4469?
Verified Reply - Solomon
Hi Kwadjo, happy to help you! This DENSO Spark Plug Iridium Power (IKH16) (Part # 5343) has a type of u-groove, heat range of 16 and the longevity of 30k miles and the spark plug (Part # 4469) has a type of standard, heat range of 5 and the longevity of 50k miles.
Hello, Will this part fit the lowere control arms of a 2017 ford f150 xlt, 5.0 engine? If not, what part fits?? Thanks
Verified Reply - Solomon
No Jose, this Driveworks CONTROL ARM BUSHING (Part # DW-K304B) does not fit your 2017 Ford F-150 XLT 5.0L. The exact control arm bushing for your vehicle is currently unavailable online. I would suggest that you visit the nearest Advance Auto Parts store to check the availability of this part.
Displaying Question & Answer 1-5

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