Brisk Iridium Performance RR15YIR spark plugs for Chrysler, Dodge and Jeep 5.7, 6.1 and 6.4

With their very long service life, the P-series spark plugs are the most modern design for modern, highly efficient and heavily used engines.
The iridium core electrode is surrounded by a body made of a yttrium alloy and a ground electrode, which ensure a very low voltage requirement and thus extend the service life of the ignition coil.
The lower voltage requirement ensures easier cold starting and reduces the risk of misfiring due to contamination caused by oil combustion, the use of alternative fuels or longer idling times.

Properties:

• Ground electrode made of yttrium alloy with iridium core
• Nickel/zinc coating to protect against corrosion
• Lower voltage requirement
• The cylindrical shape of the insulator tip ensures rapid self-cleaning at low temperatures shortly after starting the engine

• Thread diameter: 14mm
• Thread reach: 25mm -1 "
• Hexagon: 16mm -5/8″
• Seat type: conical
• Version: Iridum / Yttirum
• Resistance: Yes
• Projected: Yes
• Heat value: 15

Fits:

5.7 Hemi engines (2 stages colder than series plugs) up to and including 2008
6.1 SRT8 motors (1 stage cooler than series plugs)
6.4 SRT8 motors (same heat value as standard plugs)

Delivery includes:

16 spark plugs