W6AR calipers were designed for the specific purpose of providing big capacity braking with large diameter rotors for heavy weight and extreme duty vehicles. For cars, itís the biggest of the big providing big brake performance for show and dual purpose street and track vehicles. For trucks and SUVís, it provides big stopping power for towing, off-road, and enhanced braking with wheel and tire upgrades. Kits listed for specific vehicles are fully compatible with OE master cylinder output and ABS function. Directional staggered vane 14.25Ē rotors provide maximum cooling for sustained high heat durability.