https://www.stainlessheaders.com/i-30498934-2-1-4-primary-6-into-1-321-stainless-steel-performance-merge-collector-16ga-321ss.html
321 Stainless Steel Performance Merge Collectors: 2 1/4" 6 into 1
321 Stainless Steel Performance Merge Collectors: 2 1/4
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https://www.stainlessheaders.com/toroidal-marine-collector-250x275-316
Water-Jacketed Toroidal Marine Merge Collectors- 2 1/2" Primary, 2 3/4" Jacket, 316 Stainless Steel
Water-Jacketed Toroidal Marine Merge Collectors- 2 1/2