I have a 08 YFZ 450 with a yoshimura exhuast kit, and im probably going to buy a 09 YFZ 450, Do any of you know if I switch exhaust will they fit? The 09 stock exhaust is different from the 08 stock exhaust. so will it fit? Cause i really wanna put my yoshi on my future 09 but my 08 still needs a exhaust!

 

The frame is different on the 450R, I am guessing you are looking to upgrade to that? Don't know if the mounts are identical but either way sounds like you need to buy a new exhaust!