LOL! i just had to.. i had BC BRs. don't know what the standard spring rates for them were, but i had em on full stiff and still loved the ride.. went around mountain runs and handled beautiful. never put it on track, so don't know about track performance, but the new owner has tracked it and gotten very good times.. i think they were good bang for buck really, where the car is street-ed and tracked only on rare occasions..