I bought this muffler to use as a secondary muffler on my Generac 5735 GP17500E 26 250w 992cc. see OHV electric starter portable gas generator. The muffler does an excellent job of silencing the Generac. The generator is equipped with a 992 cc two-cylinder engine. CM and 30 hp, which was loud in both the exhaust and intake fan noise. The silencer reduces the exhaust noise to almost zero. The only thing I'm not clear on is which end of the muffler is for the muffler outlet. I use a centered port as input and an offset port as output. It seems to work.
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