Flowmaster American Thunder Dual Exhaust System - 1970-74 Camaro/Firebird V8 28315M8 Frame mounting holes are designed

Frame mounting holes are designed for 1/2" fasteners and slotted for a universal fit in many applications

660 in Valve

The standard non perimeter seal Racing Optics tear offs are OK

1984-1992 Oldsmobile Custom Cruiser

Flowmaster American Thunder Dual Exhaust System - 1970-74 Camaro/Firebird V8 28315M8 Frame mounting holes are designedFor the person who is looking for a complete Header back dual exhaust system with an aggressive tone. With easy fit in mind, these systems are mandrel bent for maximum performance and include specially selected mufflers. 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