Yeah I have 400 f/r with the koni/GC. It is a little too stiff for pittsburgh roads, but it is fine on smooth roads. I love the setup though. I did something stupid a week ago and got sideways but it was suprisingly easy to get back under control. If you are going to run a rear biased system I would strongly recomend you go to some autoX sessions to get a feel for when and how it breaks loose, and to get some experience with those "oh shit" moments.