Ford Mustang Forum - View Single Post - Are 355's my best option
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post #2 of (permalink) Old 01-02-2012
5.0L Member
S197 Member
Joined: Dec 2011
Location: Springtown
Posts: 10
I have the 355 rear end. I can't compare it to yours, so I am not sure how much of a difference it will make performance wise. But I was getting 24 mpg originally. After getting my Pro Cal tuner and the Flowmaster cat back pro series system, I get 28 on the highway. So I don't think mpg will change much at all.

I just started a new thread as a review for the cat back system. You might want to read it if you were considering an exhaust upgrade. Drone is bad. Real bad.

2011 black C/S. Stickers are gone, 5.0 badge in place. Flowmaster cat back Pro Series/Hushpower exhaust that comes with the worst drone in history! FRPP tuner. Drop in K&N filter. Auto Tans I sit in traffic a lot. HID/security package. 3.55 rear end.
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