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As far as flow goes, the SBR manifold is molded after a greatly ported EVO3 manifold, so a ported SBR manifold will flow awesome. When porting an O2 housing one should port the outlet and both inlets, and get rid of some of the divider where the wastegate opening meets the exhaust opening. Almost the whole O2 hosing can be ported. When talking about porting the 2g manifold, at a very minimum the collector should be opened up to 7 cm and the inlets on the manifold and the runners should be smoothed.
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2.3L '95 GSX *Chris
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