The stock manifold may be used with a J-pipe for mounting a turbo. But a more direct mount is more efficient (allows more power).
Overview
Direct Mount exhaust manifold
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Stock Manifold with J-pipe
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This factory A14 forklift exhaust manifold might be useful:
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Exhaust manifold idea
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Big bore 1.5 inch mandrel bent steam pipe with HPC coating
datto1000wagon
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