Bosch Yttrium Super Plus High Performance Spark Plugs Set of 4

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Factory Engine Tuning Test Vehicle / Low Hours

Fitment summary

Volkswagen / Audi 1.8T / 2.0L 4-Cylinder (Golf, Jetta, Passat, A4, TT), Volvo 4-Cylinder, Opel / Vauxhall

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Inspected under 20x magnification. Electrode gap calibrated to 0.80mm. Ceramic insulators spotless and tested for high-voltage insulation.

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Matching set of 4 genuine Bosch Super Plus spark plugs featuring yttrium-enhanced central electrodes. Sourced from short-term dyno calibration testing. Inspected under 20x optical magnification: alumina ceramic insulators are immaculate with zero micro-cracks or carbon flashover burn tracks. Ground electrode gap verified to exact 0.80mm tolerance with wire feeler gauge. Rolled nickel-plated anti-seize threads are in perfect condition.

Specifications

Thread Diameter: M14 x 1.25mm Thread Reach: 19mm (3/4 Inch) Hex Size: 16mm (5/8 Inch) Electrode Gap: 0.80mm Factory Calibrated Core Material: Copper Core with Yttrium Alloy Protective Tip