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Discussion Starter #1
I have a guy offering me a Gruppe M muffler for a decent deal, but I don't know how to tell whether the thing is authentic, I heard there are some knockoffs out there. Is there a serial Number ethced/welded on it or is it just a sticker that can fall off?
 

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hard to tell..the fake ones are sooo good

look on M3Forum..there was a thread about it

only way to tell is in the quality of the titanium bending in the pipe
 
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