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The GSC Power Division S1 billet exhaust cam (left exhaust) is specified for 2008+ Subaru STI EJ257B engines and is listed with intake/exhaust durations of 266/264 as part of the S1 cam profile. Offered as a single billet exhaust camshaft, this item is for customers replacing or upgrading the left exhaust cam on compatible EJ257B applications where the S1 duration profile is required.
GSC P-D 08+ Subaru STI EJ257B S1 Cams 266/264 Billet Left Exhaust Cam Only
