15% OFF ORDERS $35+ | 20% OFF $100+ | ONLINE ONLY
USE CODE
FRESHCAR
*
Exclusions apply.
Advance Auto Parts Logo
Choose a Store
  • Shop All
  • Replacement Parts
  • Performance Parts
  • Accessories
  • Oil & Fluids
  • Special Offers
  • Advance Rewards
  • Advice & How-Tos
  • Project Guides
  • FAQ / Help Desk
Loading...
Share
Product thumb
Product thumb
Product thumb
Product main large
Loading...
How Would You Like To Get This Item?

Store Pickup

Loading...Loading...Loading...

Same Day Home Delivery

Loading...Loading...Loading...

Home Delivery

Loading...Loading...Loading...
Loading...
Loading...
Loading...Loading...Loading...Loading...Loading...

Product Information

Product Details
Part No. 9665
Warranty Details (7 YR REPLACEMENT IF DEFECTIVE)
The Champion Iridium Spark Plug is engineered for drivers who demand peak performance and durability. Featuring a fine-wire iridium center electrode and an iridium-platinum ground electrode, this premium spark plug ensures maximum ignitability and a sharper, more focused spark. Its V-trimmed ground electrode design enhances combustion efficiency, while the Heat-Active alloy allows the electrodes to quickly reach and maintain optimal operating temperatures under all engine loads. Built with a tapered seat and resistor type, it provides a stable and reliable performance, making it ideal for high-performance applications. Designed to deliver extended service life, this spark plug is the perfect choice for those seeking consistent power, fuel efficiency, and long-lasting reliability.

Product Features:
  • Champion Iridium - Maximum Performance. Premium Spark Plug
  • Iridium center electrode delivers maximum life
  • Fine-wire center electrode and V-trimmed for greater ignitability
  • V-trimmed ground electrode promotes sharper spark focus
  • Maintains stable operating temperature under all engine loads
  • Heat-Active alloy allows electrodes to reach optimal temperature quickly
Specifications
Center Electrode Design:
Fine Wire

Center Electrode Tip Material:
Iridium

Electrical Terminal Type:
Non-Removable Nut

Grade Type:
Performance

Ground Electrode Core Material:
Platinum

Ground Electrode Quantity:
1

Ground Electrode Tip Design:
J Gap

Ground Electrode Tip Material:
Iridium-Platinum

Hex Size:
14.000 mm

Hex Type:
Hex

Insulator Height:
0.059 in

Manufacturer Heat Range:
4

Part Description:
Spark Plug

Plug Type:
RET4WYPBX

Pre-Gap Size:
0.026 in

Reach:
1 in

Resistor Type:
Yes

Seat Type:
Tapered

Thread Diameter:
12.000 mm
Loading...
Loading...Loading...Loading...Loading...Loading...
Loading...
Loading...
Loading...Loading...Loading...Loading...Loading...
No results
Loading...
Loading...Loading...Loading...Loading...Loading...
Feedback
Be The First To Know About Deals And Promotions.
Plus, create an account to receive $5 off of $20 or more.
TOP REPLACEMENT PARTS
Brake Pads & Shoes
Brake Rotors
Alternators
Water Pumps
Starters
Brake Calipers

Order Lookup

Help Desk

Store Locator

In Store Services

Mobile App

CUSTOMER SUPPORT
Accessibility Statement
Contact Us
Forgot Password
Help Desk
In Store Pickup
In Store Services
Order Tracking
Recall Information
Return Policy
Same Day Delivery
© 2026 Advance Auto Parts
Privacy Policy
Terms of Use
Site Map
ADVANCING A WORLD IN MOTION®