1967-1972 GM F-Body System Cat-Back 3" Std (MAG15899)The MagnaFlow Street Series Cat Back Performance Exhaust System is engineered to enhance the sound, performance, and driving experience of your Sys C B 67 72 GM F Body 3inch Std. Featuring fast flowing, mandrel bent 3in stainless steel piping and 1 straight through performance muffler, this system delivers MagnaFlow's signature deep, resonant tone with dyno proven performance gains. Designed to produce Moderate exterior and Mild interior sound levels,