What does the number on the muffler really mean?

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01-22-2007, 10:54 AM

Laird SS

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What does the number on the muffler really mean?

I have two OS mufflers with the number 855 on them, yet the mounting holes are not in the same location and size is different. What gives? I thought the number represented a specific muffler.

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01-22-2007, 12:11 PM

Bax

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RE: What does the number on the muffler really mean?

For what engine? Sometimes, O.S. uses the same basic casting and changes where it mounts to suit different engines. The #855 muffler is for the .91 FSR and 1.08 FSR engines.

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01-22-2007, 12:25 PM

Laird SS

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RE: What does the number on the muffler really mean?

One muffler is on a .91FSR and other was not on an engine. It seems like the answer is that the 855 is a casting number rather than a specific muffler like I had thought.

Thanks for your prompt reply. It's refreshing to be able to get reliable answers to our questions.

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