Short tube headers before and after

Small comparison in sound with Stock manifolds Vs Short Tube Headers 1st comparison: Pictures show them side by side 2nd comparison: Weight. Short Tubes are little over 4 pounds lighter each. 3rd comparison: Cold start 4th comparison: Revs Test vehicle is a 2005 Chevy Silverado 5.3 with Flomaster 10 series exhaust, stock cats Personal opinion, I couldn't hardly tell a difference. The owner says you can kind of tell when getting on interstate.