GRiP™ 304 SS Cat-Back Exhaust System (SM1301-0210G) by ARK Performance®. Exhaust Type: Cat-Back. Exhaust Tubing Material: 304 SS. Main Tubing Diameter: 3″. The ARK “GRiP” exhaust system provides the serious enthusiast a combination of sound, style, and quality craftsmanship. As a leader and innovator in aftermarket exhaust systems we are highly recognised for ARK exclusive designs, proven HP/Torque performance gains, and their significant ARK exhaust note sound that is resonant, pure, rich, and deep.