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- Porsche 997 MK1 TURBO 2007-09
- Porsche 997 MK1 GT2 2007-09
- Porsche 997 MKII GT2 RS 2011-13
High-quality OE Match double-iridium spark plug engineered to replicate the original Porsche factory spark plug in fit, heat range, and performance. Specifically designed for the demanding combustion environment of the Porsche 997 Turbo and 997 GT2, this plug delivers reliable ignition and long-lasting durability under high thermal and mechanical load.
Sold individually, 6 spark plugs required per engine.
Fits:
Porsche 997 Turbo 3.6L 2007 - 2009 (M97.70)
Porsche 997 GT2 2007 - 2009 (M97.70)
Porsche 997.2 GT2 RS 2011 - 2013
This OE Match double-iridium spark plug features iridium-tipped electrodes on both the centre and ground sides, providing a finer, more durable firing point compared to standard plugs. The double-iridium design enhances spark efficiency, improves wear resistance, and supports stable combustion even under the elevated temperatures and pressures typical of turbocharged engines.
Manufactured to OE-equivalent standards, this spark plug offers precise thread dimensions, optimal electrode geometry, and a specific heat range calibrated for performance engines. It helps maintain smooth idle quality, crisp throttle response, efficient fuel burn, and consistent power delivery - all critical for the high-output Porsche 997 Turbo and GT2 platforms.
Designed as a direct replacement, this spark plug installs without modification and is ideal for routine service, tune-ups, or replacing worn plugs to preserve peak engine performance.
The spark plug delivers a precisely timed electrical spark that ignites the air-fuel mixture in the combustion chamber. The double-iridium construction supports a stable, strong spark and helps maintain efficient combustion over extended use.
Function:
• Generates reliable ignition for efficient combustion
• Double-iridium electrodes improve spark stability and electrode life
• Supports smooth idle and responsive acceleration
• Helps maintain power delivery and fuel efficiency under boost
Spark plugs degrade over time due to repeated heat cycles, high pressures, and electrical load. On performance engines like the 997 Turbo and GT2, worn or incorrect plugs can lead to misfires, hesitation, reduced power, and uneven combustion. Installing an OE Match double-iridium spark plug ensures dependable ignition performance, extended service life, and preserved driving characteristics aligned with Porsche engineering.
When to replace:
• Engine misfires or rough idle
• Loss of throttle response or power under boost
• Increased fuel consumption
• At manufacturer-recommended service intervals
• During routine ignition servicing or tune-ups
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
99917010390
The product you are viewing cross references to these numbers
- Porsche Boxster 986 2.7L 2003-04
- Porsche Boxster S 986 3.2L 2003-04
- Porsche Boxster 987 2.7L 2005-08/08
- Porsche Boxster 987 S 3.2/3.4L 2005-08/08
- Porsche 996 C2 3.6L 09/01-2005
- Porsche 996 C4 3.6L 09/01-2005
- Porsche 996 C4S 3.6L 09/01-2005
- Porsche 996 TURBO 2000-05
- Porsche 996 GT2 2001-05
- Porsche 996 GT3 MKI 1999-02
- Porsche 996 GT3 MKII 2003>>
- Porsche 996 GT3 RS 2003-04
- Porsche 997 MK1 Carrera 2 3.6L 2005-08
- Porsche 997 MK1 Carrera 2S 3.8L 2005-08
- Porsche 997 MK1 Carrera 4 3.6L 2005-08
- Porsche 997 MK1 Carrera 4S 3.8L 2005-08
- Porsche 997 MK1 TURBO 2007-09
- Porsche 997 MK1 GT3 / GT3 RS 2007-09
- Porsche 997 MK1 GT2 2007-09
- Porsche Cayman 2.7L 987C 2006-08
- Porsche Cayman S 3.4L 987C 2005-08
The 99760210405 is the individual coil module used on the Porsche M96 and M97 M-series engines in many 986/996/987/early 997 cars. Normally should be replaced as a set of six coils (one per cylinder)
Why these coils should be replaced
Age / thermal breakdown: coils are exposed to heat cycles and can develop internal insulation breakdown or hairline cracks in the housing. Over time this causes weak or leaking high voltage and intermittent sparks.
Misfire symptoms: a failing coil will cause single-cylinder misfires (P030x codes), rough idle, reduced power, increased fuel consumption and catalytic converter heating/damage if left. These are the most common reasons owners replace coils.
Carbon tracking / cracking: visible cracks or carbon tracking on the coil boot can provide a leakage path for spark, reducing performance and causing intermittent faults.
Connector / wiring issues: corroded or loose coil connectors can mimic coil failures; inspect connectors when replacing coils.
Fits:
Porsche 996 3.6L Inc C2 / C4 / C4S
Porsche 986 Boxster 2.7L / 3.2L 2003>>
Porsche 996 GT3 MKI
Porsche 996 GT3 MKII
Porsche 996 Turbo
Porsche 987 Boxster 2.7L / 3.2L
Porsche 987C Cayman 2.7L / 3.4L
Porsche 997 3.6L, 3.8L / 997 GT3
Does not come with securing bolts.
2 required per coil, please order separately (part number 90006708901).
Common issues reported in practice
- One or more cylinders misfire when the engine is hot but behave quite normally when cold (typical of internal coil failure or heat-sensitive cracks).
- Cracked coil housings on Boxster/996 cars, owners often replace the entire set for reliability.
- After a spark plug change, misfires appear because weakened coils can fail once higher-voltage plugs are installed; this is a frequently reported pattern.
How to diagnose (practical steps)
- Read codes: P0300 / P0301–P0306 point to misfires; note which cylinder is affected.
- Swap test: swap the suspected coil with another cylinder’s coil — if the misfire follows the coil, the coil is bad. (Common, quick field test used by owners.)
- Measure resistance: check primary and secondary coil resistances at ~20°C and compare to the ranges above.
- Visual inspection: look for cracks, carbon tracking, oil ingress, or damaged boots/connectors.
- Oscilloscope / HV probe: for deeper diagnosis a scope or HV probe can show spark energy, but most DIY diagnostics use swap + resistance checks.
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
99760210405
The product you are viewing cross references to these numbers