Much better than expected conforms to R-spec lowering clearance so it will not affect the shock/strut with abnormal wear due to drop. Much stiffer than the stock R-spec spring with stiffer rates, suitable for DD and for track use. Springs are very solid and powder coated well. Installed on a 2013 Premium and 2013 R-spec with 0 issues and perfect fitment. 8 months of use and zero issues. 4 out of 5 stars as it does exactly what it says and does no damage to the vehicle 1 star off just because it isnt a coilover.