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Power Strokes
6.4 Aftermarket
6.4 first mods.
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[QUOTE="Turdchucker22, post: 1369531, member: 24614"] I went with SPAR--TAN for my tuning and have zero regrets. They are doing a lot of updates to their tune list coming here shortly. 4" exhaust will be a bit higher pitched, 5" will have the deeper tone. Most agree there is zero performance gain going with the 5". I currently run the 275hp tune, and averaging 18-19 hand calc on the highway. The higher the tune usually yields better mpg on these trucks, as long as you're not on it, which truly will be hard to do once you unleash the beast hidden in these 6.4's. They're truly a different truck. Good luck and you have any questions there are a ton of knowledgable guys on here. Bigrpowr from No Limit is the man to talk to. He will set you up the right way for your needs. [/QUOTE]
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