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This is a option of POWERCAP for the famous LEXMAUL inlet manifold opel/vauxhall C20XE engine. Adding this part will result in more responsive throttle and power gain. The diameter of the inlet pipe is 90 mm, the diameter of the small branch pipe is 20 mm. Recommended ABS printing, mechanical and chemical post-processing.
Feel free to write to me if you need additional variants of shape or part size for your particular variant. I will gladly complete the additional options.
Works great with this gasket https://www.cgtrader.com/3d-print-models/hobby-diy/mechanical-parts/opel-c20xe-throttle-gasket