MagnaFlow Street SS Cat-Back Exhaust | GM 2500HD 01-07 (15829)The MagnaFlow Street Series Cat Back Performance Exhaust System 15829 brings out the personality of your Truck with our signature resonant, powerful engine tone and dyno proven performance. Thanks to its fast flowing, mandrel bent 3in. main piping and 1 Straight Through mufflers ending in a Dual Split Rear exit with 3. 5in. Polished Clamp On Single Wall Angle Cut Rolled Edge tips, this Truck exhaust kit has the performance chops to match its sporty