The best for Mitsubishi would be Evoscan. The software is $25 and you can get a VAGCOM cable of ebay for cheap and log with it. Unfortunately you can only log and cant tune the Galant ECU.
If you want to diagnose codes on all cars then you need a Scantool that comes with computer software. I remember buying one from Walmart and it had software CD and a separate COM cable. I think it was $100.
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