Flowmaster Crossmember-Back Exhaust SystemThis mandrel bent Crossmember Back exhaust system is custom designed for most 1964 1972 GM A body cars and is perfect for the person looking for true dual exhaust system. This system comes complete minus the mufflers and allows you to choose the sound level of the Flowmaster performance mufflers you desire for your vehicle. System features include all mandrel bent 2. 50 inch aluminized steel tubing, an H pipe to equalize the exhaust gas pressures and