In addition to the standard spark plugs, we can also offer you special racing spark plugs with very thin electrodes made of platinum or iridium. Recommendable especially for highly tuned engines and when using an inner rotor ignition.
The spark is much more stable at high revs and this type of electrode has better self-cleaning properties than common CU electrodes.
If you use a tachometer, you should buy resistor spark plugs; otherwise the tachometer will not work properly.
Also available: the NGK spark plug with a heat range of 10 and 10.5 for top high-end cylinders such as MHR TEAM, Hebo Manston II etc.
We always give the Bosch grades in brackets as reference.
Short reach = 12.7mm thread length
Long reach = 19.0mm thread length.
NGK Iridium short reach BR9HIX (W2CC) - resistor type