Find an old-school muffler shop not a new chain-style franchise and they will likely weld or add patches for very little money, $20-40 I'd say based on my own experiences.

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1962 220SE W111 Coupe, 2nd owner

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The Coupe Group (W111/112 coupes and cabs) official website
The Coupe Group on Facebook
MotoArigato: Roadworthy News & Humor