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Your Vehicle  //  Porsche  //  964 (911) (1989-1994)  //  Any
Porsche964 (911) (1989-1994)Engine Tuning

IRIDIUM RACING Spark Plugs

IRIDIUM RACING Spark Plugs

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DISPLAYING 1 to 3 (of 3 products)
IRIDIUM RACING Spark Plugs VK22 (PACK OF 6) for Porsche 964 / 993 / 996 / 997 / Cayman - 99917018390, 99917018290, 99917019590, 99917022390, 9991700VK22 - VK22
2
IRIDIUM RACING Spark Plugs VK22 (PACK OF 6) for Porsche 964 / 993 / 996 / 997 / Cayman
9991700VK22/6
Product Information
Product Information


Built on DENSO's advanced iridium-rhodium technology and the company's decades of leadership in ignition research and development as well, DENSO Iridium Racing® plugs are components of championship caliber. Using the same basic 0.4mm center electrode configuration as DENSO's Iridium Power® plug - it's simply the best available - DENSO's motorsports plug is further enhanced with a 0.8mm ground electrode of 100 percent platinum, special insulator material with 20 percent greater strength than conventional plugs, and other valuable features for hard-core race applications. Surface-gap, recessed, and ultra-compact 8mm plugs are available for a wide range of specialized racing engines. But unlike many suppliers, DENSO doesn't offer its best stuff only to a favored few in the racing world. DENSO Iridium Racing® plugs are available to anyone, right over the counter at distributors and retailers everywhere.

Features:
0.4mm iridium center electrode, the slimmest in the industry
Patented self-cleaning insulator/electrode design
Durable, reusable packaging protects spark plugs when not in use

Benefits:
Handles extreme compression and boost levels
Ultimate performance and durability
Maximizes track time, minimizes downtime

PACK OF 6

Fits:
Porsche 964 C2 / C4 3.6L 12/1988-09/1993 (kW 184; Engine 64.02 / 64.01)
Porsche 964 Carrera RS 3.6L 08/1991-09/1993 (kW 191; Engine 64.03)

Porsche 993 C2 3.6L 08/1993-08/1997 (kW 200; Engine M 64.05 / 06)
Porsche 993 C4 / Targa 3.6L 08/1995-08/1997 (kW 210; Engine M 64.21 / M 64.22)
Porsche 993 C4 3.8L 08/1995-08/1997 (kW 210; Engine M 64.05 S / M 64.06 S)
Porsche 993 C4 / RS / Targa 3.8L 08/1995-08/1997 (kW 221; Engine 64.2)
Porsche 993 Turbo 3.6L 02/1993-08/1997 (kW 265; Engine 64.5)

Porsche 996 Turbo 3.6L 06/2000>> (kW 309; Engine M 96.7)
Porsche 993 GT2 3.6L 04/2001>> (kW 340)

Porsche 997 C2 / C4 3.6L 07/2004>> (kW 239; Engine M 96.05)
Porsche 997 C2 / C4 3.8L 07/2004>> (kW 261; Engine M 97.01)

Porsche 987C Cayman 2.7L 07/2006>> (kW 180)
Porsche 987C Cayman S 3.4L 11/2005>> (kW 217)

Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.

9991700VK22
99917018390
99917018290
99917019590
99917022390
9991700VK22

The product you are viewing cross references to these numbers
IRIDIUM RACING Spark Plugs VK22 for Porsche 964 / 993 / 996 / 997 / Cayman - 99917018390, 99917019590, 99917022390 - VK22
2
IRIDIUM RACING Spark Plugs VK22 for Porsche 964 / 993 / 996 / 997 / Cayman
9991700VK22
Product Information
Product Information
Ultra Fine Electrode

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 964 C2 / C4   3.6L  12/1988-09/1993   (kW 184; Engine 64.02 / 64.01)
Porsche 964 Carrera RS   3.6L  08/1991-09/1993   (kW 191; Engine 64.03)

Porsche 993 C2   3.6L   08/1993-08/1997   (kW 200; Engine M 64.05 / 06)
Porsche 993 C4 / Targa   3.6L   08/1995-08/1997   (kW 210; Engine M 64.21 / M 64.22)
Porsche 993 C4   3.8L   08/1995-08/1997   (kW 210; Engine M 64.05 S / M 64.06 S)
Porsche 993 C4 / RS / Targa   3.8L   08/1995-08/1997   (kW 221; Engine 64.2)
Porsche 993 Turbo   3.6L   02/1993-08/1997   (kW 265; Engine 64.5)

Porsche 996 Turbo   3.6L   06/2000>>   (kW 309; Engine M 96.7)
Porsche 993 GT2   3.6L   04/2001>>   (kW 340)

Porsche 997 C2 / C4   3.6L   07/2004>>   (kW 239; Engine M 96.05)
Porsche 997 C2 / C4   3.8L   07/2004>>   (kW 261; Engine M 97.01)

Porsche 987C Cayman   2.7L   07/2006>>   (kW 180)
Porsche 987C Cayman S   3.4L   11/2005>>   (kW 217)

Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.

9991700VK22
99917018390
99917019590
99917022390

The product you are viewing cross references to these numbers
Spark plug connector, cylinder 3 exhaust. Porsche 964 / 993 - 91160231300
3
Spark plug connector, cylinder 3 exhaust. Porsche 964 / 993
Special Order item
91160231300
Product Information
Product Information

Genuine Porsche spark plug connector this connector is for cylinder 3 on the exhaust side; it is a spark plug connector.

Fits

  • Porsche 964 (911) C2 1989–93
  • Porsche 964 (911) C4 1989–93
  • Porsche 964 (911) RS 3.6L 1991–93
  • Porsche 964 (911) RS 3.8L 1991–93
  • Porsche 964 (911) TURBO 3.3L 1991–93
  • Porsche 964 (911) TURBO 3.6L 1991–93
  • Porsche 993 (911) C2 1994–97
  • Porsche 993 (911) C4 1994–97
  • Porsche 993 (911) RS 1994–97
  • Porsche 993 (911) C2S 1994–97
  • Porsche 993 (911) C4S 1994–97
  • Porsche 993 (911) TURBO 1994–96
  • Porsche 993 (911) GT2 1994–97
  • Porsche 993 (911) TURBO S 1994–97

    Check fitment for your specific vehicle (model, year, engine) before ordering.

    Diagram ref no 26

What This Product Does

This connector forms the connection between an ignition lead and its spark plug. It is an ignition connection component, rather than the spark plug itself or a complete ignition lead set.

Functions

  • Connects the ignition lead to the spark plug terminal.
  • Provides the plug-end connection within the ignition circuit.
  • Allows renewal of the connector when inspection identifies deterioration.

Technical Details

  • Porsche part number: 91160231300.
  • Porsche identification: cylinder 3, exhaust-side spark plug connector.

Symptoms of Fault

  • Misfiring or an uneven idle.
  • Hesitation, particularly under engine load.
  • Ignition problems that become more noticeable in damp conditions.
  • Cracked insulation, loose connections or corroded terminals.
  • Tracking marks indicating electrical leakage.

Why Replacement Matters

A deteriorated connector can interrupt the ignition connection or allow electrical leakage. Replace it when inspection confirms damage, corrosion or poor contact, rather than assuming that a misfire identifies this component alone. Check the associated lead and spark plug during diagnosis, as faults elsewhere in the ignition system can produce similar symptoms.

FAQs

Is this a spark plug or a complete lead set?
No. Part 91160231300 is the spark plug connector.

Should replacement be based only on a misfire?
No. Inspect the connector, lead and plug, and confirm the fault before replacing components.




Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.

91160231300
91160231300

The product you are viewing cross references to these numbers
DISPLAYING 1 to 3 (of 3 products)
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About IRIDIUM RACING Spark Plugs

Porsche Iridium Racing Spark Plugs - Motorsport-Grade Ignition Performance

Iridium Racing Spark Plugs are engineered for extreme performance environments where ignition precision, heat resistance, and consistency are critical. Designed for high-RPM, high-compression, and motorsport-focused Porsche engines, these spark plugs deliver a powerful, stable spark under the most demanding conditions.

Available from Design911, Porsche Iridium Racing spark plugs are manufactured using advanced iridium electrode technology to ensure reliable combustion at sustained high engine loads—making them ideal for track, race, and heavily tuned applications.

What Do Iridium Racing Spark Plugs Do?

Iridium Racing spark plugs provide precise and reliable ignition under extreme engine conditions.

Core Functions:

  • Deliver a strong, stable spark at high RPM.
  • Support efficient combustion in high-compression engines.
  • Resist heat-related breakdown during track use.
  • Reduce misfires under sustained load.
  • Maintain consistent ignition timing and performance.

High-quality ignition is essential for safe, high-performance engine operation.

Why Do Standard Spark Plugs Fail?

Standard spark plugs are not designed for prolonged high-load or motorsport use. Common failure causes include:

  • Electrode erosion at high temperatures.
  • Spark blowout under high compression or boost.
  • Heat range mismatch for tuned engines.
  • Carbon fouling during aggressive driving.
  • Reduced ignition stability at high RPM.

These failures can result in misfires, power loss, and increased engine stress during performance driving.

Why Upgrade to Iridium Racing Spark Plugs?

Iridium Racing plugs are purpose-built to exceed the limits of conventional spark plugs.

Upgrade Benefits:

  • Ultra-fine iridium electrodes for precise ignition.
  • Exceptional resistance to heat and wear.
  • Stable spark delivery at extreme RPM and load.
  • Optimised for motorsport and high-output engines.
  • Improved reliability during track and race use.

Upgrading ensures dependable ignition performance in demanding driving conditions.

Highlights

  • Porsche Iridium Racing spark plug upgrades
  • Motorsport-grade ignition performance
  • Designed for high-RPM and high-compression engines
  • Superior heat resistance and durability
  • Ideal for track, race, and tuned applications       

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