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Shane, you never dropped a heat range on your plugs, even with a modded sled? Bly, Shane is right you need to get your air/fuel mixture close before you mess with the plugs. Go to the ngk website. they have more info than you will ever need on plugs and heat ranges. As for losing 10 mph, sounds like its miss clutched. Give d&d a call, They will probably have the exact kit to match your mods. KEEP IT PINNED
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You got the talkin' part done!
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