I'd guess that t+7 is right too... unfortunately I too did not weigh them
Worthy to note that the other muffler I had made from a local performance shop in Phoenix weighed ~half as much as the Stillen muffler and had 3" pipe. I think Stillen used heavy gauge metal, heavy tips, extra gusseting, etc. Not a slam on Stillen at all, just an observation that they decided to trade off weight savings in their design process - perhaps to improve reliability???
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