E30 Zone

I have a running condition 323i. The problem is that i'm worry that some of the wiring isn't working well. There are some direct connection straight from the +ve terminal of the battery.

What i have in mind is to get a 325i engine and replace the inlet manifold, throttle body, afm, ecu, injectors and of coz, the wiring loom.

Is there a write up on this and is this idea workable?

Would there be any increase in power by doing so?

If your going to go to all that trouble why don't you just replace the engine as well