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- Porsche 924S 2.5L 1986-87
- Porsche 924S 2.5L 1988
- Porsche 944 2.5L 8V 1982-87
- Porsche 944 2.7L 8V 1988-89
- Porsche 944S 2.5L 16V 1987-88
- Porsche 944 Turbo 2.5L 8V 1985-88
- Porsche 944 Turbo 2.5L 8V 1989-91
- Porsche 944 Turbo S 2.5L 8V 1988
- Porsche 968 3.0L 1992-94
- Porsche 968 Sport 3.0L 1994-95
- Porsche 968 CS 3.0L 1993-95
- Porsche 928S 4.7L 1981-83
- Porsche 928S2 4.7L 1984-86
- Porsche 928S4 5.0L 1987-92
- Porsche 928GT 5.0L 1989-91
- Porsche 928GTS 5.4L 1992-95
- Porsche 914 (1970-1976)
By harnessing the power of Iridium, DENSO is suddenly able to shrink the surface area of the center electrode - the critical component of a spark plug. Unlike a typical platinum plug that has a 1.1mm diameter center electrode, DENSO Iridium Power plugs have the world's smallest center electrode measuring 0.4mm in diameter. This means that the voltage requirements are decreased while firing performance is greatly improved.
Fits
Porsche 914 4 cyl engines
Porsche 924S 2.5L (engine codes M44.07/08/09/10)
Porsche 928S 4.7L (engine codes M28.11/12/21/22)
Porsche 928GT / S4 / S 5.0L (engine codes M28.47/41/42/43/44/45/46)
Porsche 928GTS 5.4L (engine codes M28.49/50)
Porsche 944 2.5L (engine codes M44.01/03/05/06/09/10)
Porsche 944S / Turbo 2.5L (engine codes M44.40/50.51.52)
Porsche 944 2.7L (engine codes M44.11/12)
Porsche 968 3.0L (engine codes M44.43/44)
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
9991700IW20
The product you are viewing cross references to these numbers
Porsche Iridium Power Spark Plugs - High-Performance Ignition Upgrade
Iridium Power Spark Plugs are designed to deliver a stronger, more consistent spark for improved combustion efficiency, throttle response, and engine performance. Featuring ultra-fine iridium electrodes, these spark plugs require less voltage to fire while producing a more precise ignition spark—ideal for high-performance and tuned Porsche engines.
Available from Design911, Porsche Iridium Power spark plugs are engineered to improve ignition reliability under high temperature and high RPM conditions, making them a popular upgrade for both road and track-driven vehicles.
What Do Iridium Power Spark Plugs Do?
Iridium spark plugs ignite the air-fuel mixture more efficiently and consistently.
Core Functions:
- Produce a stronger, more focused ignition spark.
- Improve combustion efficiency and throttle response.
- Support smooth engine operation at high RPM.
- Reduce misfires under load.
- Enhance fuel efficiency and performance consistency.
Reliable ignition is critical for optimal engine performance.
Why Do Standard Spark Plugs Fail?
Conventional copper or platinum spark plugs degrade over
time due to heat and wear. Common failure causes include:
- Electrode erosion from repeated firing.
- Increased voltage demand with age.
- Carbon fouling and contamination.
- Heat-related breakdown in performance engines.
- Misfires under high load or boost.
Worn spark plugs can lead to poor performance, rough running, and reduced fuel efficiency.
Why Upgrade to Iridium Power Spark Plugs?
Iridium Power spark plugs are designed to outperform standard plugs in demanding conditions.
Upgrade Benefits:
- Ultra-fine iridium electrode for efficient ignition.
- Lower firing voltage and improved spark stability.
- Increased resistance to heat and wear.
- Longer service life compared to standard plugs.
- Ideal for tuned, high-performance, and track use.
Upgrading improves ignition reliability and supports consistent power delivery.
Highlights
- Porsche Iridium Power spark plug upgrades
- Stronger, more consistent ignition spark
- Improved throttle response and combustion efficiency
- Designed for high-RPM and performance engines
- Long service life and reliability
