Well, I would like to update some info also. I have the std flex +8 chassis, and I installed the Dimec20 in my sons car. I drive on a clay med-med/hi bite track, and his is definitely better than mine. I figured with the lower temps in my area, that the softer chassis may be a better choice, but it makes my car lazy compared to his, the stiiffer chassis is much more consistent, at least IMO. The softer chassis will be good in low traction situations.