I still say that 600lb/in is extremely stiff for a car with an aluminum block (even if it does have a blower).. even for a highly-tracked street car you would be sacrificing a lot of ride comfort as well as exntension travel and ride height, since the stiffer springs would make you ride higher and potentially run out of extension travel on really uneven terrain, and worse case scenario you would lose grip. However this last point isn't teribly relevant since all of the coilover conversion systems still allow our cars to have tons of wheel travel, and I doubt yours would be riding high enough for this traction loss to be a real concern.
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