Yz400f exhuast

What other Yamaha exhausts will fit a yz400f

I'm guessing a 426 one might?

a 426 exhaust will fit, and a 03-05 450 one will fit as well

I tried a 05 450 and it didn't work

Not all of them will.  Usually, only the '03-'05 pipes that are made in three pieces will fit.  Those in which the midpipe and muffler are welded together require tweaking, or simply won't bolt up. 

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