We just switched mine from 3.55 to 3.31 rears. Will help alot to keep in the boost during shifts and alow more time in the powerband. Should help alot compared to the 3.55. Maybe one day Ill get it back from the shop and can drive it for a day or two before it gets cold.
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2011 Mustang 3.7L V6
No mods just stock. Trust me its slow.
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