I installed a pedal commander on my 16 SPS which is awesome; however, my tires spin like crazy. I ordered Petty's sway bars and was about to order Speedlogix subframe connectors & rear arched shock tower brace until i hit check out and was hit a 350$ shipping cost. That was two large of a pill to swallow, so i decided to opt for Petty's subframe with 30$ shipping and just get tbe rear bracefrom Speedlogix, but it was 150$ for shipping alone. So for now, i'll get the Petty's subframes and decide latet down the road for the rear shock brace. BTW, my car has CAI, MMX ported throttlebody/ported intake manifold, Diablo canned tune and yes i have wider tires 275/40 front and 315/35 (Falkens) rear. Great quite, smooth riding tires, but not great for fraction. Will be upgrading to Michelins or Continentals in the distant future.