Straight-through, nonrestrictive design, specifically tuned for the Shelby GT 500 Flow bench-tested 43% gain in exhaust flow vs. stock system. 304 stainless steel construction, crafted with pride and precision in the USA. Handcrafted, polished stainless steel single Pro-Series 4.0" tips for enhanced vehicle appearance. Direct bolt-on installation to factory X-pipe; no cutting or welding required. Includes all necessary hardware and detailed color installation guide with photographs. 50-state emissions legal. Limited LIFETIME WARRANTY for as long as you own your Shelby GT 500. CORSA exhaust systems are not warranted to meet any specific local, state or federal noise ordinances. Please check applicable laws before installing.