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It's funny, most e36 fanatics might tell you to replace the OBD2 manifold with the OBD1. This is due to airflow restrictions in the OBD2 manifold. I decided to stick with the OBD2 manifold for the 3.0. This is supposed to give me better torque numbers. However since the new head install, I might try the OBD1 manifold out and see if that opens up airflow even more. Probably not necessary though.

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