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Rc3094
Posted on Thursday, May 06, 2010 - 10:13 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only)

Is the header outside diameter the same between the XB9's and the XB12's?

Thanks!
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Speedfreaks101
Posted on Thursday, May 06, 2010 - 11:23 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only)

No, the primaries are different sizes. I don't recall the amount but there is a difference.
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Glitch
Posted on Friday, May 07, 2010 - 06:02 am:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only)

The exhaust ports are the same, in other words, you could (if you wanted to) use either the 9 or 12 header on either bike.
However the exhaust tubes are larger on the 12, not sure by how much though.
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Greg_e
Posted on Friday, May 07, 2010 - 09:30 am:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only)

If you look at for far down the 9 header is necked, you'll get a good idea of the size difference. It is significant.
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