Being Mitsubishi, there are a buncha expensive performance kits that are avail, but I often have to offset rotors to allow for big brakes with small wheels and there are always class rules.
I've had great success knocking the rotors off the hubs, machining hubs as nec to fit the rotor diameter/offset/vented/etc to specs nec for the application.
I usually use inexpensive finned alum calipers avail from many imports .
This isn't just a bolt on, takes some experience/fabrication, and could be very challenging for a novice.
Here's one of the rotor guides I use, there are others.
If it helps, I recently used Mazda RX7 rotors on the stock Toyota hubs, with the 4 piston finned alum calipers from same.
Another needed 13 wheels, so I used 4" offset Mini rotors/hats to bring calipers inboard of the wheels.
Search for Mitsubishi performance sites, or find what hubs you have.
Good luck, - it can be done, I think those cars came turbo, if so, what brakes ?
https://www.allrotors.com/brake-parts-search.php