For the past week my truck has been developing a rattle. Well today I climbed underneath to have a look and I noticed that the muffler was cracked(4"mbrp less than 2 years old). Front of the muffler right where the muffler goes from 4" to the expanded size it cracked all the way around( the 4" pipe is rattling inside the muffler). Going to try welding otherwise bye bye muffler.

 

Tell that muffler goodbye!!!!!! Straight piped 7.3s sound soooo good!!!

 

Unless you need that darn this to pass emissions, get ride of it. My suggestion.

 

Couldnt agree with you more Ian!

 

That was my vote also, thanks guys.

 

I removed my 4inch MBRP muffler. Truck sounds awsome!

 

The truck sounds good without a muffler but with the right window down you can't carry on a conversation without yelling