2003 GMC Sierra Z71 5.3L V8 3" one chamber performance exhaust muffler

[@andyherring8416]

Always remember to rout the exhaust dump so it can create the most heat on the rear diff fluid it adds like 25hp LMAO

[@andyherring8416]

Heat is not your friend !

[@MartinFuentes126]

I have the exact Flowmaster on my 03 Sierra 4.8 but no turn-down or extension. Don't get alot of interior resonance too?

[@KJBPSkipper]

Those catalytic converters are plugged up..