I've got the Cobb rear bar which is set at the lowest setting. The car really didn't roll that bad on the two tight courses we had. My instructor is a pretty avid auto-x/road racer and has an incredibly sweet notchback 5.0 with a built 306 and the typical NA mods and one wild suspension setup including the K-member swap. He openly admitted he knew nothing about G35's. He drove my car and was throughly impressed stating he wouldn't change a thing. It understeers when it should and it oversteers when needed. He asked about my mods and then said "get R compound tires next and don't change anything else. It's balanced the way it should.".