NGK Iridium Spark Plugs, 03-05 Neon SRT-4 / 03-07 PT Cruiser GT

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Model Number: 220143

Price listed is for a set of four!!

These spark plugs are the most popular, and best spark plug available for the 03-05 Neon SRT-4 and 03-07 PT Cruiser GT.

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 are available different heat ranges:

  • Stock heat range (LZTR5AIX-13)- Stock heat range is for cars that are BONE stock with no increase in boost.
  • 1 Step Colder (LZTR6AIX-13)- Colder range, is for 90% of SRT-4 drivers out there, who have increased the boost with a good number of bolt on mods.
  • 2 Steps Colder (LZTR7AIX-13)- For big turbo, big turbo engines only, in the 450+hp range.

Recommended spark plug gap for the Neon SRT-4.

  • Stock Turbo, OEM Boost Level: 0.038"-0.040"
  • Stock Turbo, Modified & Higher Boost Levels: 0.034" - 0.036"
  • Big Turbo: 0.030" - 0.034"
  • The higher the boost, the smaller the gap you should be using!

Ask a Product Question

  • Anonymous
    What should one step colder be gapped at? Im running a Mopar stage 3 with turbo toys Tial mecanical wastegate and my PSI spikes around 24.5
    1 Answer
    • Modern Performance

      Low 30's, we'd recommend anywhere from 28-33 for gap for that level of boost.
  • cj
    what should these be gapped at for a stage 2 no toys
    1 Answer
    • Modern Performance

      We'd recommend a .36-.40 gap.
  • Ryan
    05 srt cai, stock range plug or would 1 step colder help, or hurt any?? Thanks
    1 Answer
    • Modern Performance

      If you have less than 15 psi of boost, stock heat range. If you have 15-22 psi of boost with stock turbo, 1 range colder plugs.
  • Jason
    Stock Turbo, cold air intake, larger intercooler (Stupid Racoon), Tune. 1 step colder plugs. What should the gap be?
    1 Answer
    • Modern Performance

      Your gap is determined by 1) turbo and 2) boost. You never mentioned boost level so its difficult to answer your question. If you are 14-16 psi then you should be about 40 thousandths. If you are 17-20 then you should be closer to 35 thousandths.
  • Sam
    What are the one step colder plugs gapped at? If they're pretty gapped at all..
    1 Answer
    • customer service rep

      These do not come pre-gapped, you need to gap them yourself based on your cars turbo/boost pressure.
  • Anonymous
    I am running a .50 trim with over 25psi of boost. should I run the 1 step colder?
    1 Answer
    • customer service rep

      At least two range colder, 28-32 thousandths.
  • Anonymous
    stock turbo 14psi, cai, larger intercooler, 3in downpipe, full 3in exhaust, and a tune. would "stock" plugs work or 1 step colder?
    1 Answer
    • customer service rep

      Stock boost level- stock plugs
      Increased boost 17-20 psi one range colder
      Bigger turbo? More boost? Two ranges colder
  • ragan
    I'm in the middle of running I ran the step colder plugs burnt em out now I'm running the coldest. I having a fully build motor,stage three cams larger valves 70 trim Garrett, what would be the best gap. I'm doing low boost pulls right now 15 psi but will be going to 25 + where should the gap be
    1 Answer
    • customer service rep

      At 25 psi, you should be in very low 30's or high 20 thousandths.
  • Anonymous
    Have syked ecu stage1,intake, front mount, 3in exsaust no cat.. 2003 srt4...boost spikes at19.. Drops to 15... What should gap b at?
    1 Answer
    • customer service rep

      Most stock turbo cars should be in the .034-.040 range. The more boost, the lower the gap. Close to 20 psi, should be somewhere between .034-.036.
  • Ryan
    If I'm going with the stage 1 basically using the stock turbo to its fullest potential...What would u recommend as plugs and the gap??

    (I'm going off of your guys bolt-on upgrade plan)
    1 Answer
    • customer service rep

      We would recommend one range colder NGK iridium plugs and a .38 thousandth gap.
  • Brink
    What spark plug wires should I run with the 1 step colder?
    1 Answer
    • Customer Service Rep

      Any of the wires we offer will work great with the NGK plugs.
  • Hunter Piatt
    What if I have a stock turbo running stock boost but have bolt ons like agp waste gate, turbo xs blowoff valve, front mount, CAI, and MSD wires?
    1 Answer
    • Customer Service Rep

      If you have not increased boost, you should go with stock heat range. If you increase boost, then you get one range colder.
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