Our Olds Bravada had the tail pipe rust/break off at the weld at the muffler. So, I am probably going to order a Walker Quiet Flow 3 muffler, but, noticed that they offer an alternative to that muffler with their SoundFx muffler. I'm curious if the difference in loudness between the two is large, and since it's a 6 cylinder, I'm worried that the SoundFx muffler would sound horrible. So, does anyone have one of these Walker SoundFx mufflers and what's your impression of it? Thanks!