Hello all! I wanted to share a video I put together of my 04 5.3 truck. It had a glasspack on it when I bought it, I ran it single straight pipe with a Y merge for awhile, then a catalytic converter broke apart ( i suspected it was clogging ) so I put in OBX style 1.75" longtube headers, catless Y, and a Borla XR-1 #40085 muffler. Sounds phenomenal to me. Have a listen!