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Can you use a turbo exhaust manifold off of 4g63 on 420a?

No, you can't directly use a 4G63 turbo exhaust manifold on a 420A engine. The engine blocks, cylinder head bolt patterns, and exhaust port locations are completely different. They are not even remotely compatible. You'd need a custom manifold or an aftermarket manifold specifically designed for the 420A to use a turbocharger.