Review on 🚗 Enhance Your Driving Experience with Walker Exhaust Quiet-Flow 21576 Muffler Assembly by Emmanuel Chouinard

For 2003 GMC Sierra 2500 (Non-HD) 6.0L 143.5" WB. The existing exhaust pipe just ahead of the stock muffler is 2.8" OD so I went with this muffler from Walker; Inlet ID 3". I also bought a Walker exhaust pipe 55538. 55538 fits my existing exhaust hangers. I used 3 3" exhaust pipe clamps. I was a bit concerned about the 0.2 inch difference in intake port diameters, but after tightening the clamps there were no leaks. Then I announced the truck. IMPRESSIVE! It was actually quieter than the OEM muffler. Exhaust pipe I had a hole where one of the hangers came loose. I think I got used to the extra noise. Now I mainly hear the turning of the fan and the fan clutch in the cockpit. I am very happy with the damper.