YZ 450 Stock Exhaust

Does anybody know...

If The stock exhaust system (from the header all the way back) from a 2008 YZ 450 F will fit on a 2006 YZ 450?

They look similar... The header looks larger in diameter and the tailpipe is obviously half the size of the enormous 2006 can...

If somehow it does fit.. What kind of Jetting issues could I expect to have?

If it doesn't fit.. I've been contemplating hacking half of that huge exhaust can off... Same question... Would I have some tweaking to do?

Any advice is appreciated...

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