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Old 01-04-2014, 12:06 PM   #10
Join Date: Feb 2002
Location: Stance
Posts: 13,107
It's the intake manifold. The OBD1 320's manifold, while tiny, is more in the shape of the OBD1 B25/B30 manifold than the OBD2 328 piece. The "M50 manifold" makes open air intakes noticeably louder.
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