Some videos I found on YouTube while doing a search...

2008 Ninja 250r (zx250r) stock exhaust
http://www.youtube.com/watch?v=YKMdTXI01c4

2008 Ninja 250r (zx250r) with Yoshi slip on
http://www.youtube.com/watch?v=1IoFtOuZHVw

2008 Ninja 250r (zx250r) Two Brothers Exhaust
http://www.youtube.com/watch?v=zNk0pg3d-_8

2008 Ninja 250r (zx250r) with Remus Pipe
http://www.youtube.com/watch?v=UY1zZK0jdYM

2008 Ninja 250r (zx250r) Area p exhaust
http://www.youtube.com/watch?v=QoCHjBTr_y4

I just put on the Yoshimura slip on....holy crap what a difference.. I am getting more compliments on my bike and how it sounds than all the rest of the group that i ride with (i am the only girl and the only 250) mwahaha



http://www.youtube.com/watch?v=mIdim9djhSA
(without exhaust...omg sounds like a beast haha)

and With the Yoshi slip-on....it purrrs!
http://www.youtube.com/watch?v=STCGWCPdDwI

hahaha, nice!