I love the 4.10s for an n/a car. I mostly drive mine on the streets though. The advantages over the stock 3.31s, when street driving, include better acceleration (more fun) and the fact that I'm in 5th gear at 40-45 mph (better mileage). However I really don't do much highway/freeway driving with the car.
2007 GT: Comp 127300s, Steeda UDPs, JLT Series III CAI, FRPP Manifold and T-Body, BBK LTs/O-R X-pipe, MGW, Fidanza A.F., Exedy Mach 400, Shaftmaster, FRPP 4.10s, lightweight wheels with a bunch of suspension and braking mods. 366 rwhp./326 rwtq. N/A