Is this a swap worth doing? I've been trying to find info for it, but I only find info on swaps into 5th gen and lower civics. Would I need to get new engine mounts and axles? I figure I can get an engine, transmission, ECU, and harness for less than $2000, so what other costs might I have?

 

I take it B16a2 from a 99-00 SI. The procedure is similar to the 5th generations, swapping out D-motor to B-motor. You are going to be working with OBD2 instead of OBD1 that's all. You will need 94+ B-series shift linkage, mounts, and axles for the B16a2. ECU and harness should be plug and play. Correct me if I am wrong.