STILLEN 508276 Stainless Steel Cat-Back Exhaust System - 08-13 Nissan Altima Coupe Complete Cat-Back Exhaust System; Stainless Steel Construction Polished Stainless Tips, End Pipes and Mufflers Increase of Horsepower and Torque Mild at Idle/Cruising - Aggressive Note Under Throttle; Limited Lifetime Warranty