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Quick spark plug question...

Browsing over at czp it appears to me :confused: that they offer the NGK IRIDIUM IX as an upgrade to the highly recommended NGK PRF6B-11B?? The Iridium ix can be purchased here at quite a reasonable price...

 

Fair enough the price difference isnt that big but are there any real smoothness or performance gains to be had with the IRIDIUMs?

 

any experiences or advice on these 2 variants?

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