Info From Press Release Etc
"The tS employs German Sachs dampers that are tuned differently than those on the standard BRZ. They are 15 perfect stiffer in the front of the car and 3 percent stiff in the rear. The suspension setup as a whole has been retuned, resulting in 10 percent less roll reduction and 15 percent less pitching. Brembo handles braking duties. The wheels are now 18-inches shod in sticky, grippy Michelin PS4 215/40R18 tires. Do all of the tweaks add up to STI’s goal of pure handling delight?"
"Next, STI added flexible V-bars to the engine bay. The V-bars look like a typical V-brace, but halfway down the length you see that each bar is actually two bars connected by pillow ball joints, the idea being that allowing a little movement on each bar will reduce harsh impacts and result in better suspension behavior. There are also two flexible draw stiffeners connecting the front subframe to the body. The idea here is to reduce yaw time and improve steering accuracy. Still with me?"
From
http://www.motortrend.com/cars/subar...-drive-review/