Shaves 11lbs of unsprung weight from the rear of your car while increasing braking performance, plus they bolt on just like stock! This is great alternative to a full on Big Brake Kit since the stock B8 S4 and S5 rotor is already a stout 330mm (12.9") and most may not want to spend $2,000 plus for a full Big Brake Kit. We basically brought the same high performance great cooling designed rotor to these drop in (fit like stock) rear rotors and at a 1/4 of the price or less of a full Big Brake Kit.

Stock vs. JHM
-Rotor Weight: Stock = 17lbs(each), JHM = 11.5lbs(each) - 32% LIGHTER, 5.5lbs less each.
-Rotor Cooling Air-gap: Stock = 6.35mm(.250"), JHM = 13mm(.511") - LARGER for better cooling
-Rotor Cooling Center Fin Design: Stock = Straight Fin, JHM = Airfoil - MORE EFFICIENT for better cooling
-Rotor OD: Stock = 330mm(12.9"), JHM = 330mm(12.9") - SAME
-Rotor Thickness: Stock = 22mm(.866"), JHM = 22mm(.866") - SAME
-Bolt pattern: - SAME (fits like an OEM rotor would)