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Doug Thorley Single Exit Exhaust System. Doug Thorley Headers have been making performance exhaust power simple since 1958. Now, with their fresh line of Doug Thorley Cat-Back Exhausts, extra tire-spinning ponies have never been easier to add to any vehicle. Doug Thorley Cat-Back Exhausts know the quickest route to extra power: quality materials, top-end engineering and a premium fit. All pipes are 16-gauge aluminized steel tubing that's CNC mandrel-bent to eliminate backpressure. Free-flowing exhaust jets through a premium Thorley Aeroflow muffler for power and a manly exhaust rumble. Doug Thorley Cat-Back Exhausts fit perfectly and look great, too. Integrated factory-style hangers make for simple installation. In fact, most systems require no cutting or welding. And, each exit pipe is topped by a premium chrome exhaust tip. Your Doug Thorley Cat-Back Exhaust boasts a Lifetime Warranty to the original owner, too. Easy power makes your performance exhaust choice easy: install a Thorley! Doug Thorley Single Exit Exhaust System. Exhaust, Mufflers & Tips, Performance Exhaust Systems.