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Discussion Starter #1
6.7, cold air kit, full exhaust, highest tuner availabe and the same for a 6.4. I'm not sure of how high the tunes are for a 6.7 but if it's a 275 then the same thing for a 6.4. Which would win? I did a search but, couldn't get an answer.
 

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the 6.4's are powerhouses and if you're going all out on tunes a 6.4 will most likely win. Highest tune for the 6.7 I believe is a 200 and you can run up to a 350 tune on the 6.4. I've already ran a few 6.7's with H&S programmers and pulled them pretty hard.
 

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Discussion Starter #3
That's the kind of answer I need. Anyone else? Why are the tunes so small for the 6.7? I was told, it was because of the fuel system.
 

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Aren't some of the fastest 6.7 tuned trucks running like low 14's? I don't think the the 6.7 is any match for a 6.4 with equal mods.
 

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Yeah I believe the fuel system and turbo is to blame for them to not be able to add as much power when tuned compared to the 6.4
 
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