I'm looking to upgrade the diff on my 2005 and was wondering what people recommend? I was thinking of going Wavetrac with a 3.55 gear, but was wondering if there are any other suggestions out there. Since I don't take my car to the drag strip, and only track it once a year do I really need the 3.55 gear? Most of my driving is on the highways cruising through the mountains. Also if I upgrade the diff do I need to do the half shafts as well?