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Author Topic: 71 CB500 4-2 versus 4-1 exhaust  (Read 1643 times)

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Offline ataylor136

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71 CB500 4-2 versus 4-1 exhaust
« on: November 28, 2011, 08:16:51 PM »
I have a grubby old 4-2 exhaust that I was considering adding some reverse megaphones. My other alternative is a 4-1 system like offered by MAC. I am looking for info on which would provide better performance without requiring a ton of jetting changes. I plan on running the factory air box.
Thanks for the help!
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Offline CoachDoc

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Re: 71 CB500 4-2 versus 4-1 exhaust
« Reply #1 on: November 28, 2011, 08:51:40 PM »
I had the Mac on my 550 for a short while before I went back to stock, and performance was unaffected- no re-jetting required. Looked real good too.
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Offline seanbarney41

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Re: 71 CB500 4-2 versus 4-1 exhaust
« Reply #2 on: November 28, 2011, 08:57:06 PM »
claimed performance gains with exhaust mods are very hard to quantify on the street...the only thing you can really be sure of is weight loss...4 into 1 should be lighter than a 4 into 2...
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If it works good, it looks good...

Offline Danno

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Re: 71 CB500 4-2 versus 4-1 exhaust
« Reply #3 on: November 28, 2011, 10:24:28 PM »
use the mac if you don't want to rejet but you would get better performance out of the 4 into 2 but most likely would have to rejet
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