Beginning with the new 2015 Mustang GT Premium Fastback equipped with the 6-speed manual transmission and GT Performance Package (with Recaro seats), H&R installed their Super Sport Spring kit to lower the vehicle 1.75” front and rear. (H&R Super Sport Springs feature slightly more lowering that Sport Springs while still maintaining superior ride quality and comfort.) Then they installed a set of Forgeline one piece forged monoblock SE1 wheels, 21x9 in the front and 21x11 in the rear, finished in our Tinted Gold powdercoat (that pops perfectly against the Guard color of the Mustang) and Michelin Pilot Super Sport tires (265/30ZR21 front and 295/30ZR21 rear).