BMW M60 M62 HKS performance spark plugs 740i 740il 840ci 540i e32 e38 e34 e31

Set of 8 high-performance HKS spark plugs for your tuned M60 and M62 engines. These plugs have a colder heat range, one step down from the factory specification, making them a superior choice for enthusiasts seeking to maximize performance. Ideal for setups with aggressively advanced ignition timing from a performance ecu tune/chip or forced induction systems such as superchargers, these plugs enhance combustion stability under high-performance conditions. Advancing ignition timing by 10° can raise spark plug tip temperatures by approximately 70–100°C, which can push standard plugs beyond their optimal operating range. The colder heat range of these HKS plugs helps to dissipate heat more effectively, reducing the risk of pre-ignition and detonation. By maintaining a lower firing-end temperature, these plugs ensure consistent performance and reliability in engines operating at higher cylinder pressures and temperatures. This translates to smoother acceleration, improved power delivery,