Jet Pro Exhaust 650sx

I posted in the General Forum, but thought I should try here too. I'm hoping one of you experts may be able to help me. I have an old Jet Pro exhaust with the stainless steel header pipe. Like most all steel header pipes mine has cracked and leaks water at the manifold flange. I might be able to have it welded but it will crack again for sure. So I am looking for an aluminum header pipe that will closely match to work with my expansion chamber. The problem I am having is that the coupler diameter is 3" on my Jet Pro Header. I found a Coffman's on ebay but the coupler diameter is 2 3/8". Do you all have any suggestions of what might work? The Jet Pro looks to have a very similar bend as the Coffman's. Any help would be appreciated. Oh I have called Jet Pro and they have nothing available. Thank you all for your time.
 
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This is what the expansion chamber looks like.
 
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