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SVT Shelby GT500
NGK Iridium IX Spark Plug - TR6xi
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<blockquote data-quote="Willie" data-source="post: 16478866" data-attributes="member: 14133"><p>Heat Range 5: TR55ix Stock #7164</p><p>Heat Range 6: TR6ix Stock #3689</p><p>Heat Range 7: TR7ix Stock #3690</p><p>Heat Range 8: TR8ix Stock #3691</p><p></p><p>I've used 3691 for over 10 years. Currently 24# boost. Never a hiccup and unlike the 3689 which I used to change every 5k miles due to misfires, the 3691 have held true.</p></blockquote><p></p>
[QUOTE="Willie, post: 16478866, member: 14133"] Heat Range 5: TR55ix Stock #7164 Heat Range 6: TR6ix Stock #3689 Heat Range 7: TR7ix Stock #3690 Heat Range 8: TR8ix Stock #3691 I've used 3691 for over 10 years. Currently 24# boost. Never a hiccup and unlike the 3689 which I used to change every 5k miles due to misfires, the 3691 have held true. [/QUOTE]
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NGK Iridium IX Spark Plug - TR6xi
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