I've got Eibach Prokit springs and Bilstein Sport shocks sitting in my garage, and am about to pickup GC's with ERS 450/375 springs. Don't know what the Prelude application Prokit rates are, but I'm guessing they're ~350/200. I drove the seller's car with the GC's installed, and the ride wasn't too bad with his Koni's. Could someone please shed light on how much the Prokit' and GC's with these ERS springs will differ in terms of ride quality and handling?

 

IMO the GC will handle better, and the prokit will have better ride quality.

the prokit is a progressive spring, were as the ERS are linear.

 

Will the difference be great? Only the rear Prokit spring is progressive.