Magnaflow Street Series SS Cat-Back | Hummer H2 6.0L V8 (03-06) (15770)The MagnaFlow 2003 2006 Hummer H2 Street Series Cat Back Performance Exhaust System brings out the personality of your 6. 0L 2003 2006 Hummer H2 with our signature resonant, powerful engine tone and dyno proven performance. Thanks to its fast flowing, mandrel bent 2. 5in. main piping and 1 Straight Through mufflers ending in a Dual Straight Passenger Side Rear exit with 4in. Polished Welded On Double Wall Angle Cut Rolled Edge tips, this Hummer H2