Do a search for the Series I and Series II engine differences. There'* a few good lengthy threads that get'sd down to the nitty gritty. From what I know off the top of my head is different superchargers, different intake manifolds, and different wiring harness and PCM'*.
Location: home in jersey...school in daytona beach
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the metal access panel is to get to the fuel pump i actually just got finished changing mine today not that bad of a job but for all you guys that go to the dealership and they tell you they have to drop the tank to change our fuel pumps like they told my brother its complete bs