I don't know much about N/A Supra exhaust but I'm going to bet it's going to be safe to assume that from the header-back there's going to be 3 main components. 1) The Header, 2) The Catalytic, 3) The Piping (to include the muffler). As far as I can tell it seems your on the right track on upgrading the exhaust. I don't think there's a downpipe because that usually is refference to turboed vehicles. Good luck.
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