Magnaflow offers two options for S197 GT owners looking to upgrade their exhaust system. You can replace everything from the catalytic converters back with their Cat-Back System (above), or you can save a little cash and make installation easier, too, with the Axle-Back System (middle). Improve performance get the sound of power for your pony car! V6 owners also upgrade from the axle back with our latest addition. All feature polished tips for a custom look. Product Specifications Material: 100% Stainless Steel Tubing O.D. Size: 2.5in. System Type: Cat-Back TIP O.D. Size: 4in. TIP Quantity: 2 Single/Dual: Dual Exit Position: DUAL SPLIT REAR EXIT