NGK Iridium Spark Plugs, 08-09 Caliber SRT-4

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Model Number: 221263

These spark plugs are offered in one range colder (perfect for Caliber SRT-4s with increased boost) and two range colder (for 20+ psi of boost).

Be sure to select which plugs you want from the drop down menu below before adding them to your shopping cart.

These spark plugs are the most popular, and best spark plug available for the 08-09 Caliber SRT-4.

Why? Well, they have excellent heat durability, help provide a consistent spark that will help you have a smoother idle, eliminate any stumbling, and maximize power!

These do NOT come pre-gapped. You'll have to gap them yourself, we recommend 0.032" - 0.035" for the Caliber SRT-4.

This listing is for a set of four spark plugs. Quantity of 1 means a set of four plugs.

Ask a Product Question

  • Tim
    Hey, still learning bout the csrt4 and this is my first turbo car, so id rather ask stupid questions than mess up or break hard parts. I have an 08 csrt4 with a lower eng mount, mpx bop, drop in aem filter, and a side exit muffler delete. I drive my car hard from time to time but it is my A to B. Looking for ur opinion on stock or 1 step colder ngk iridiums? Also an opinion on plug gap? I'm still running stock boost and i've heard everything from .32, .35, .38, and .40! Thoughts? Thanks
    2 Answers
    • Modern Performance

      Anytime you are running higher boost, and or driving the car hard you should use one range colder. We recommend anywhere .35-.38 gap for factory turbo cars with 15+ psi boost.
    • Armon

      stock boost .35 gap, if your running stock boost and plan on upgrades just buy the -1 heat range and save yourself the trouble.
  • Kyle Cota
    Are your NGK one step colder Iridium Spark Plugs come all four for 30 or are they 30 a piece
    1 Answer
    • Customer Service Rep

      This is a set of four spark plugs, just as shown in the photo for the product. It says 1 in the cart, because thats the price for one set of four.
  • Jkap
    Which one do you recommend me more one step colder or two step boosting 18psi?
    1 Answer
    • Customer Service Rep

      We do not recommend going to two step colder plugs until you go over 20 psi.
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