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Yes they can be repaired but not likely by a muffler shop. Ti needs to be Tig welded and by someone that is familuar with welding Ti. I have never seen a "muffler shop" with a Tig welder let alone one that can weld Ti. I would check around to your local fabricators and find one with Ti experience.
It has to be TIG welded with a special process! he shop must be familuar with Ti and set up to weld it. They have to use a special shield gas and it has to be very clean!! Unless your getting them for a steal, find an un-cut set. You will probably speng $75 $100 to get them welded.
I have seen them go for $375-$500 IN THE C5 PARTS FOR SALE SECTION.
I tried welding titanium once. Have you ever seen magnesium burn? Titanium is not quite as aggressive, but almost! That's the reason it has to be inert gas welded.