WTB ski doo muffler # 054124 is the ID number stamped on the inlet tube spring flange. Came on 2006 Summit, GTX, GSX and MX Z 800 with HO Ptek, 2007 MX Z, GTX, GTX with 800HO Ptek.![Help :help: :help:](https://www.snowest.com/forum/images/smilies/new2010/help.gif)
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