1320 header is not designed for any turbo setup so custom routing piping just to utilize a header that is not developed with the angles and room for a turbo setup is not ideal period. I imagine the header would perform well itself, it just doesn't make sense to try and fab up a turbo to attach to this header.
The header takes up the same space, has the same angles, and mounting flange as the stock exhaust manifold so as far as fitment it would be plug and play with any turbo system designed to work with the stock manifold ..... check with your turbo system manufacturer regarding tuning ....
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It is also recommended for NA use with unsupported exhaust systems (those that hang just from the header with no or little bracing) since its tubing is thicker and welds beefed up.
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