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Discussion Starter #1 (Edited)
The problem is you need to deal with the full electronics/harnesses...etc.

You will also need to change out the final drive in some combinations because they don't all have the same ratio, particularly when you're upgrading from a 4 cyl engine to a 6 cyl engine.

Don't get too greedy. If you choose to get an M3 engine, you may find the gearbox may not fit your available space. Some cuts to the sheet metal will be necessary.

Suggestion: buy an E36 328i, then start your work from there. It's a lot cheaper, and opens up a lot more possibilities. Most 328i will also have more equipment to begin with Benz star c3.
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