

Make one and cast the rest...
as if the tooling required to do a casting is free, and falls from the sky, and the foundry wouldn't mind stopping everything they are doing to pour you a dozen.
A total POS made in china, sheetmetal intake, for one of the most popular engines in the world the ls. sells for $500, on ebay. A quality custom intake for one of those engines is in the thousands.
With the potential volume, there is no way any one could design, test, and manufacture for near the price guys on here are asking for. Hell at $400 a pop, you couldn't do the R&D, nevermind building one
This chinese POS 4 cylinder intake goes for over $500