o and now these are in the mix, i give up

 

Eh, sort of. The NGK 7173 Plugs have been used for quite some time by the S2000 Forced Induction Community. They are a copper, non-resistor, 1 heat range colder spark plug! The individuals who have a much higher boost level have begun to look at the NGK 7405 Plugs. These are a copper, non-resistor, 2 heat range colder plug.

While these plugs have been used by several members for quite some time, including myself... geists2k has found a Copper, Resistor, 1 Heat Range Colder Plug that will work!