Description These Racing Competition plugs from NGK offer excellent performance when your Horsepower needs start to go above what your stock spark plugs can deal with. These are longer lasting Iridium tipped variant, thile costing more than the platinum tipped plugs. Iridium tipped plugs are designed to offer a longer service life compared to the chaper platinum plugs. Please consult your engine tuner/builder for their specific recommendations however As a rough guide the 10’s and 10.5 are a popular choice for bridge ported or peripheral ported engines running turbo or NA when pushing the limits of the standard BUR9EQP plugs These plugs are not normally recommended for street use unless you are running some high boost. The higher the number on the heat rating the colder the plug, colder plugs will increase the possibility of fouling for street applications and idle speeds however the significantly reduce the rick of detonation due to high boost conditions. Available in the following hear ratings 9 10 10.5 11 These plugs are special order and are sold in pairs to allow you to mix and match for your specific application. Special Order items are cannot be cancelled for more information please check our T&C’s.
