I bought the American Thunder axle back for my 2012 GT. I've looked at pictures and the mufflers are not the box shaped but more oval which look like the 05-10 American Thunder mufflers. However the hangers and the piping appear to be correct for the 2011-2012 American Thunder axle backs. Have they recently changed the design? The mufflers do not have a part number that I see. Any help would be appreciated. I posted this from my phone and can't post a picture at this time.

 

So, are you unhappy with the sound?

If not, whats the issue?

They prolly ditched the bathtub exhaust and got something that doesn't weight 2 tons.

he he he

 

The issue is I don't want to go install it and it not fit correctly.

 

It appears they've changed the design. Found some pics on the actual flowmaster website.

 

Mine were exactly the same as yours, one side squared, one side oval? They fit perfectly on my 2012 GT.