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Advance Auto Parts Logo
1205 E Main St
Columbus, OH 43205
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Product Information

Product Details
Part No. AR25
Warranty Details (2 YR REPLACEMENT IF DEFECTIVE)
The ground electrode is cut-back from the center electrode to provide a gap, and its concave face ensures a constant gap to the center electrode. This design opens the spark face for better ignitability of the flame kernel and retains less heat, transferring it to the shell faster to reduce the risk of pre-ignition. Dyno testing has shown proven power gains, making it ideal for all aftermarket cylinder heads used in various racing venues, including oval and road racing. The cut-back ground electrode evolved from the practice of grinding back the side electrode, and it features a tapered seat type for optimal performance.

Product Features:
  • Opens spark face for better ignitability of flame kernel
  • Retains less heat, transfers heat to shell faster - reduces risk of pre-ignition
  • Dyno testing has shown proven power gains
  • Cut-back ground electrode evolved from practice of grinding back the side electrode
  • Optimal Performance: Features a tapered seat type for optimal performance in various racing venues, including oval and road racing.
  • Durable Design: Engineered to handle intense conditions, making it suitable for all aftermarket cylinder heads used in competitive racing environments.
Specifications
Electrode Tip Material:
Resistor

Reach:
.460 in

Resistor:
Suppressor

Seat Type:
Tapered

Thread Diameter:
14 mm

Tip Configuration:
Power

Wrench Diameter:
5/8 in

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4.79 out of 5
28 Customer Reviews
100% of respondents would recommend this to a friend
Ratings Distribution
5 Stars
23
4 Stars
4
3 Stars
1
2 Stars
0
1 Star
0
ExcelentExcelentGreat plugs
Auto lite plugs
Pros
2
Easy To Install
1
Durable
Cons
No Cons
Best Uses
1
Performance Driving
1
Racing
1
Replacement
Describe Yourself
1
Casual Driver
1
Competitive Driver
1
Mechanic
Most Liked Positive Review
Best spark plug
PLACEMENT PART FOR TUNE UP
Most Liked Negative Review
see comments
I was sent 6 of these plugs, and 2 Bosch Spark plugs. I don't know why this happened, but I ordered 8 Autolites, and should have received 8 of them, not 6 and then 2 random Spark plugs that I didn't want. Shipping dept screwed this up.
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Displaying Reviews 1 - 5Back to Top

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can this item be transfer to anthens ,tn store
Verified Reply - John the Car-Doc
Hi Wendell! We do handle only technical questions regarding product fitments, specifications, diagnosis, and repairs. For in-store shipment-related inquiries, please call us at 1-877-ADVANCE (238-2623) and press option 3 so that you could speak to our store customer care and they will be in a better position to assist you.
will these work on a Subaru Forester 2019 model base? 2.5 engine
Verified Reply - John the Car-Doc
Hi James, I'm glad to assist you! This Autolite High Performance Racing Resistor Spark Plug - Part # AR3924 is universal and is not application specific. You would have to match one by size to what is on your 2019 Subaru Forester 2.5L that can be fabricated into its place. The exact fit spark plug for your vehicle is unavailable online. I'd recommend that you visit the nearest Advance Auto Parts store to check the availability of the product.
Will this work in a 92 Mustang GT
Verified Reply - Steve
No, Dennis. This Autolite Racing Resistor Spark Plug - Part # AR25 does not fit your 1992 Ford Mustang GT. However, we do offer an exact fit Autolite Copper Resistor Spark Plug - Part # 25 for your vehicle online.
How much do these affect gas mileage?
Verified Reply - Steve
Hi, I'm glad to assist you! This Autolite High Performance Racing Resistor Spark Plug - Part # AR3924 has copper electrode core material. Autolite has been rated the service life of the copper core about 32K miles.
Part No. AR3924 Autolite High Performance Racin If I can use it for a 2009 Nissan Murano
Verified Reply - Steve
Hi Jose, I'm glad to assist you! This Autolite High Performance Racing Resistor Spark Plug - Part # AR3924 is universal and is not application specific. You would have to match one by size to what is on the vehicle that can be fabricated into its place.
Displaying Question & Answer 1-5

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