The memcal or calpack or netres whatever you want to call it is like a super basic backup chip that can run the engine if the main chip fails. Its the chip that operates the engine when its in limp home mode. I think the chip is just a bunch of resistors or something. Anyway there are a few different varieties that will run 6 cyl or 8 cyl motors ect. You will need a calpack from an 8 cyl vehicle if you want to run an 8 cyl engine.
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