same bolt pattern but different port/runners.
the gen2 3sge inlet manifold has 4 runners and ACIS
the gen1 3sge inlet manifold has 8 runners and TVIS same as the turbo models.
when i got my st162 it had a gen2 engine/head but the numbnut6s that put it in used the gen1 inlet manifold. so the ports didnt line up to well etc. but it physically bolts up the same.
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