Mustang GT, made better by XForce: bit.ly/XForce-Mustang-GT Uniquely engineered for the S550 Mustang GT, our range includes a Header & Cat Kit as well as a Cat-Back System which can be combined to achieve the ultimate in performance and sound. Featuring a tuned length design and 100-cell high-flow metallic cats, our headers increase power throughout the rev range whilst also assisting the 5.0 V8 to produce a spine-tingling note. The Cat-Back system is a direct replacement bolt-on upgrade which f