K, I just got my motor rebuilt with a lower compretion ratio for boost, how ever turboing my car will not happen for another year, can any one point me in the right direction to find a good performance ECM.

Some shops do carry them in stock just because it's a mitsubishi motor. Call around and you might be able to find one.
I did!

call a japanese motor shop you should be able to get one for $350- 500 with about 40 k on it.

I'm looking at doing a major rebuild on my 98 avenger how ever i dont know if i should do a performance rebuild my motor
or spend the extra money and get the 4g63 with harness and tranny?

Thanks