I have 3.31s and the Pro-Cal tune on my Brembo car and I can't hook worth a crap on the street. However, I hate 6th gear. I hate it so much that I would consider putting 4.10s in this thing.
Also, how are you guys getting such good mileage? The best I have ever seen was around 24 and that was sustained highway cruising at between 80 and 85. My combined mileage is about 18, and I don't pound the car constantly.
2012 Mustang GT M6, tuned by AED. 11.79 @ 116.26 with 3.31 gears.
<------------ Click Under New Orleans for my YouTube videos. Tons of exhaust and drag racing vids with my 2012 GT.