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exhaust question

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My friend has a 1999 yz400f. I put my 2004 yz450f full exhaust on his bike with little mods. I had to drill out the header flange holes ( one side or the other just a little ) and had to open up the hole on the muffler braket that bolts to the subframe. I don't think you can use the yz400f header on the yz450f mid pipe/muffler combo. The headers are 2 different sizes were they connect at the mid pipe. Good luck!

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