Intended for ultra-high performance street use. They are designed for street driven production vehicles. The Trophy Sport Big Brake Kits use the same STR calipers AeroRotors and AeroHats found in the full-race Trophy Kits but add silicone dust boots for extended service intervals and anti-rattle rotor mounting hardware for quieter operation. They also include StopTech Street Performance Brake Pads for high performance street and occasional track use.Trophy Sport Big Brake Kits are the ultimate street braking system.They include forged lightweight StopTech STR calipers floating slotted AeroRotors stainless steel brake lines and race engineered caliper brackets. Easily identifiable by their unique shape and finish StopTech Trophy Big Brake Kit components feature a MIL-spec hard-anodizing on the Trophy STR calipers and AeroHats that is impervious to color change or fading at extreme race temperatures.StopTech Trophy Kits feature ultra-high performance STR lightweight forged calipers in six-piston four-piston or two-piston configurations. Based on the highly praised StopTech ST-60 ST-40 and ST-22 calipers STR calipers feature the same metallurgy and design but are engineered to provide up to a 20-percent reduction in weight without sacrificing stiffness or performance.All StopTech Trophy Big Brake Kits include:Patented StopTech AeroRotors for optimized airflowPatented billet 7075 aluminum AeroHats to further increase airflowForged StopTech STR calipers with patented bolt-in bridge for ultimate stiffnessStopTech stainless steel brake linesRace engineered caliper bracketsHard-anodized finish on calipers and hats that resists fading and discoloration