6g74 ecu reflashing, is it possible?

I have a few questions regarding reflashing Mitsubishi 6g74 ecus,

I own a Mitsubishi Challenger 1997 3.5 v6 gdi

And a 1993 Mitsi Pajero 3.5 v6

both have obd2 ports however I have a feeling the 93 is only obd1 software

Wondering if you guys have any experience with the innovative LM2 and using evoscan or something similar reflashing software?

really want to know my options of how to reflash these vehicles

Mods on both the vehicles include 2.5 exhaust system, headers, catch can, snorkel and egr blanked off