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Steel flange (not stainless steel) for 12mm thick head (suitable to become 10mm after relative flattening and not like the classic ones that are on the market from 10 which becomes 8mm causing venting)
Compatible with Opel Astra S 1800 16v
Using this flange it is possible to build the manifold or at least to make jigs for particular applications.
Specific References
Steel flange for Opel Astra 1800 16v exhaust manifold 12mm thick head.