Matte Black Solid Polyurethane Splash Guards (FGT101020) by Stillen®, 1 Pair. Location: Rear. Stillens Nissan GT-R Mud Guards are a great way to protect your cars finish. Made out of Poly-Urethane they are designed to deflect any stones or other road debris that could damage your vehicles paint finish. Initially designed for the Stillen Nissan GT-R that founder and World Class racing driver Steve Millen uses to compete in the Targa Newfoundland road rally and other rally events, these splash guards were designed to protect the finish from road debris along the rally course. While still a primarily on-road rally, the rally is conducted on public/country roads (sometimes covered in gravel), so Stillen needed a way to protect the finish from any road debris along the race course.