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Hi pdb,
How stock looking do you mean?
Are you concerned with how the end plates are crimped and how the seam on the body is done?
Also, originally the muffler was welded directly to the exhaust pipe, no clamp was used.
Corvette Central has some nice welded systems including an 'off road' system with fewer baffles which MIGHT help performance a TINY bit but does give a little more sound.
Good prices and often good deals on shipping. Install easily too.
Regards,
Alan