exhaust question

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Thinking about a new exhaust and when i was talkin to the guy about exhaust building he said (talking about twin cans) that the exhaust gases had to mix because somthing to do with it helped the engine by drawing off each other (cant remember his exact words)

if thats true why can choppers and the likes run to seperate pipes for each cylinder, and is that what gives them the unique sound?

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nobody?

[Speedy]

Hmmm,

Was he talking about Back-pressure aiding the next combustion cycle?

[G]

I think the SV main system does have a link, I remember seeing it when takings mine off. No idea what reasons its there for or if the guy is talking sense.

[CanaDan]

http://s990.photobucket.com/albums/af25/CanaDan/th_Picture081-1.jpg

Here is a dually set-up for the SV650. It is from WileyCO; it is a full system