"Only fits vehicles with single 2.5"" flanged catalytic converter." American Thunder Kit Cat-back 409S 86-91Cam/Fbird Cat-back System 409S - Dual Rear Exit - American Thunder - Moderate Sound Cat-back System 409S - Dual Rear Exit - American Thunder - Moderate Sound - 1986 to 1991 Chevrolet Camaro and Pontiac Firebird Exhaust System Kit Fits 1986 to 1991 Chevrolet Camaro and Pontiac Firebird with a 5.0L or 5.7L V8 engine. Flowmaster, cat-back, dual rear exit, american thunder, 409S, 817234 For the person who wants the look of a traditional dual exhaust system with all the benefits that a Flowmaster Cat-back exhaust system provides. DOR. (Dual out rear) systems are the perfect choice. American Thunder systems deliver a moderate to aggressive interior and exterior tone and are suited to the enthusiast who wants their performance to be heard. Like all Flowmaster systems, the benefits include improved throttle response, power and mileage. Designed for an easy fit, these systems include all necessary parts and hardware for easy installation.
