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Discussion Starter · #1 · (Edited)
Exhaust system cat remove.

Would this do anything to the back-compression of the bike. The engine is standard except for the Harley Davidson exhaust.
I have a 1981 Cx500.
 

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If you are referring to the H-box under the engine then yes, you will need to rejet if you go to straight through pipes.
 

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Discussion Starter · #3 ·
Thanks! Sorry I don't know everything about bikes. What if I remove the Cat out of the exhaust?
 

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You mean baffles!
It will get louder but as long as the H-box is in place you will not need to rejet.
 

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A little terminology would help clarification.

CAT is short for Catalitic Converter. These bikes do not have a catalitic converter. CATs are typically filled with a expensive mix of chemicals to convert noxious exhaust into harmless tailpipe emissions.

H-box is the large exhaust expansion chamber under the bike. It is a common volume shared by both cylinders. Each header dumps into this common chamber. This is a source of mythconception. The myth is each header exhausts from the muffler on the header side of the bike. Actually, both mufflers are exhausting one cylinder at a time.

Baffles are the restriction plates inside the mufflers located on side of bike. The baffles are design in such a manner to reduce and absorb exhaust sound.


Now, I suppose you could have a Tabby or Siamese cat under your bike....If so, then it should be removed.
 
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