I have Tenabe sustec pro full coilovers in my DC and I find that they are to soft for the track. they are mint and adjustable. they are quite smooth and compliant on the street. i need something with a stiffer spring rate.
if you find your coil overs to harsh on the street, trade me for mine. I payed $1000 and I will trade plus cash.
thanks

 

why dont you just buy stiffer springs ? they dont even have to be made by tenabe ....... i had a Cusco kit on my eg6 with 10f 8r and i put on HKS 14 12 , it worked good ( but it was a bitch driving up and down st clair lol )

 

I just ordered tanabe a210 8kg springs. so I'm going to throw those on the front and move the old 6kg springs from the front to the rear and see how that goes. i think its still not going to be stiff enough. so I'll prob get a set of 10kg (back ordered) and then do the same thing all over again. stock was 6\4.