E43 13-20 Tuning (W213) Regular fit Discharge occurs in the spark

Discharge occurs in the spark support gap (space between the tip of insulator and the base of the outer electrode) to help prevent carbon buildup

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E43 13-20 Tuning (W213) Regular fit Discharge occurs in the sparkOptimum Tuning by ZAC Motorsport Optimum Tuning is ZAC Motorsports in house performance calibration division. Every tune is developed to deliver the perfect balance of power, response, and reliability, customised for your specific vehicle setup. Unlike generic flash files, Optimum calibrations are tailored to your intake, exhaust, altitude, fuel quality, and driving style ensuring the engine operates efficiently in all conditions. The result is