MagnaFlow Street Series Stainless Cat-Back Performance Exhaust System | Pontiac GTO (05-06) (15892)The MagnaFlow 2005 2006 Pontiac GTO Street Series Cat Back Performance Exhaust System brings out the personality of your 6. 0L 2005 2006 Pontiac GTO with our signature resonant, powerful engine tone and dyno proven performance. Thanks to its fast flowing, mandrel bent 2. 5in. main piping and 2 Straight Through mufflers ending in a Dual Split Rear exit with 4in. Polished Welded On Double Wall Angle Cut Folded Edge tips, this Pontiac GTO exhaust kit has