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Tune ?

Semp1

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So I'm planning to put in headers and 3.73 Torsen diff pretty soon. Do you think I should just go with 4.09 gears before I swap the diff? I'm already tuned for E85 with standard 3.55 LSD.
If you’re going to stay NA don’t even bother with 3.73’s. They feel like 3.55’s on the 18+. 10000% go with 4.09’s instead. You won’t regret it. I promise that.
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moose13

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Seconding everyone calling for the 4.09 gears with the Ford Performance tune. I just did the PP2 in my '16 and the new throttle mapping alone is is worth the price for entry. I can only imagine what it feels like with 4.09 gears.

Lots of people recommending headers too which is not a bad idea, but if you've already deleted the resonator and Roush axle-back, you are going to a level of noise that might be a bit much for a DD.

Someone correct me if I'm wrong here, but putting an H-Pipe with a an axle-back exhaust effectively makes it a cat-back, no? I mean, you've effectively changed everything back from the cats....
 
 








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