Super Jet B-pipe repair

After many years of dedicated service, my Factory B-pipe expansion chamber has developed a crack along the weld. The hairline crack, which leaks, is about 7 inches long. What are my repair options, both quick fix and long term? What kind of welder works best and what should I tell the person who's welding this that they might not already know?
 
Needs to be tig welded. We do them all the time. If you want it welded let me know. Best way to do it is sand blast it weld it then repowder coat it.
We can do it all and any color you want.
 
Thanks for the responses. I'll most likely go local to get back to the lake as quickly as possible. A professional coat of paint would be awesome though!
 
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