NGK Spark Plugs · Part number IGR7A · NZ$79.00 incl. GST
For your high-performance turbocharged beast like the Mitsubishi Lancer Evolution, spark plugs aren't just any old part; they're critical ignition components that absolutely must stand up to extreme combustion pressures and temperatures to deliver consistent grunt and prevent misfires when you're on the boost, and the NGK option we stock is a top-shelf choice for keeping your Evo humming.
NZ$79.00 including GST. Part number IGR7A.
Spark Plugs for Your Evo: Keep that 4G63 Roaring!
> Right, so your spark plugs are the unsung heroes, igniting the air-fuel mix in your engine's combustion chamber. Now, in a high-boost monster like your Mitsubishi Lancer Evo V through VIII, these little champs cop significantly higher cylinder pressures and temperatures than your average family sedan. Gutted plugs mean misfires, power loss, and potentially engine damage — which is a proper nightmare when you're pushing that 4G63 turbo hard on track days or giving it the beans on a spirited drive.
Symptoms That Led You Here
• Engine misfires or rough idle, especially under boost
• Noticeable power loss during acceleration
• Poor fuel economy despite normal driving habits
• Check engine light with misfire codes (P0300-P0304)
• Hard starting in cold NZ mornings
• Hesitation or stumbling when coming onto boost
Will it pass WOF?
Spark plugs themselves aren't a direct WOF inspection item, but the symptoms of worn plugs—excessive emissions, rough running, or a persistent check engine light—can cause your Evo to fail emissions testing or visual inspection. Keeping ignition components in top condition ensures your performance machine stays road-legal in New Zealand.
DIY or Workshop?
Difficulty: 4/10 | Time: 45-90 minutes | Tools: 10mm socket, spark plug socket (16mm), torque wrench, extension bar, anti-seize compound
On the 4G63 engine, spark plug access is relatively straightforward once you remove the coil packs. The key challenge is ensuring correct gap specification and torque settings—over-tightening can damage aluminium heads, while under-tightening causes poor heat transfer. For Evo owners running modified boost levels, consulting a specialist about heat range adjustments is wise.
Expert Recommendation
Bob and the CARFIX team recommend replacing spark plugs every 30,000-40,000km on turbocharged Evos, or more frequently if you're tracking the car or running increased boost. The NGK IGR7A is engineered for high-performance applications and delivers the precise heat range these legendary 4G63 engines demand. Bob @ CARFIX is always on hand to help you work out exactly what plug heat range and gap suits your Evo's tune. Make sure you head over to Bob's Shop for a chat!
Fitment Notes
• Confirmed fitment for Mitsubishi Lancer Evo V RS450 Ralliart (1998), Evo VI (1999-2001), Evo VII (2001-2003), Evo VIII (2003-2005), and Evo IX (2005-2007)
• All variants use the 4G63T turbocharged engine but may have different ECU maps affecting ideal plug choice
• Modified vehicles with aftermarket turbo upgrades or increased boost may require colder heat range plugs—check with Bob before ordering
• Always verify plug gap against your specific tune; factory spec is typically 0.8-0.9mm but modified cars often run tighter gaps
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🛠️ Bob's Pro Tip: Do the Job Right!
> If you're replacing this spark plug, make sure you've got the right workshop prep, protection, and safety gear ready. Taking a bit of extra time and using the proper safety stands and cleaners makes all the difference for a professional result!
🧰 What Else You'll Need:
• Safety First: Always secure your vehicle on heavy-duty safety jack stands before working underneath. Never rely solely on a hydraulic jack.
• Clean Hands: Keep a pack of Nitrile Gloves handy to protect your skin from grease, oils, and chemical sprays.
• Preparation: Have microfibre towels and a suitable parts cleaner nearby to keep components clean during installation.