I have 3.29's from TEP installed and I love it. Definitely a worthwhile upgrade. The 3.69's (in my opinion) would be for track use. With 3.29's and the trac cont set to off, I have accidentally smoked the tires taking off quickly from a stop. I would imaging the 3.69's would be hard to keep tame. Would be fun at the track though, if you could launch the car that is heh.