All I know about exhaust for motorcycles is that they need backpressure to run, hence why we can't just run open pipes(which, by the way, would be awesome if we could).

So anyway, my question is, could someone explain how the motor uses backpresure to run correctly.

I want my exhaust, on an F3, to end right where it leaves the lower fairing. I figured that the easiest and cheapest way would be to just cut the pipe there and weld in some kind of baffle.

I'm sure I could just rig something up that would "work" but I want to understand what I'm doing and I especially don't want to do anything to my bike that will hinder it's performance.

 

http://www.tomorrowstechnician.com/tt/tt020526.htm
The article is about cars, but nearly all of the information can be applied to bikes, it's a good primer for knowing what you're getting yourself into.

 

That helps alot, thank you very much.

One more thing I forgot to add, my freind said that running open exhaust on a sport bike has the potention to fry to exhaust valves.

I know thats true when you run a car motor without even an exhaust manifold, but it doesn't hurt it at all with the manifold and nothing else on. Is it the same for sportbikes?

I'd think since it revs far beyond what a car does it may be different.