VERY,VERY expensive. But

if some one wants one after everthing is said and done i would  be interested
in building it.

Thanks Ed, The reason I mentioned the Ti exhaust possibility is the 
durability when heated. I know it costs a lot, but it has excellent 
thermal fatigue characteristics. That is why you see it used in hot 
sections and critical aircraft parts subject to heat cycling. 

Paul,  I agree that weight savings on a simple tangential muffler 
would be minimal. I know there are several companies making Ti tube 
and sheet much cheaper than before. I would still build my own out 
of stainless (thick) to start with.
Bill Jepson

 
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