Project Mu, Japan's premier Brake Performance manufacturer, is proud to release their new Forged Aluminum Caliper Kit. Using technological advances in manufacturing and forging, Project Mu is able to develop a lightweight, highly durable, and lower cost caliper to substantially improve braking performance. Based on their previous billet aluminum racing caliper kit, the Forged Aluminum Caliper Kit is a full bolt on front brake system. Front 4 Pot.