5" x 8" Oval Center/Center Stainless Steel Universal Muffler
18" case/ 24" overall

How does is sound at low rpm? How about highway speeds?
Any opinions would be appreciated. Cant decide between this and the
5"x11" with 22" case.

I have 5.3 tahoe all stock right now.

 

I have the 4x9x?18? I think it sounds great. Its quiet on the highway, not bad normal driving, and just plain mean at wot.

 

I have that muffler with my full custom exhaust (Pacesetter longtubes, no cats, flowmaster y, all mandral bent) and it sounds nice. Not that loud cruising around and at 70mph, I can bearly hear it at all. It does resonate a bit under load in the lower rpm and it screams wot. I also have the exit dumped out of the rear corner so that accounts for a little of the resonation.

 

I have 5x11x22 3" SI/SO swapped for stock muffler. all stock piping and it sounds ok...idle is nothing special just sounds like uhhhhhhhhhhhhhhhhhhhhhhhhh (description of the sound...say it and you'll know what i mean)...under throttle sounds pretty good...wot is great

 

Any more open than stock design will resonate around 2200 rpm. But that muffler is not bad and it is throaty and cheap. I would do it again, but I would dump it and save the install fee