450R exhaust on 350X what years??

[Dirtcrasher]

My buddy wants a 450R exhaust on his 350X, I have the tools so I'm helping him. I'm told the 06 and 07 are different than the 2004 and 2005.

Anyone know the difference? Is anyone running the newer years, I wondered if it had a different bend and maybe a easier mod for the 350X.

Thanks for any help!