Chrysler was selling lots of Mitsubishis by the early 1980s, including the Colt econobox, the Dodge Ram 50 pickup, and the Plymouth Arrow truck. The Challenger's Plymouth-badged sibling was the Sapporo.
This one had a bunch of late-1990s receipts from Los Angeles-area shops, and a check of the VIN on the California smog-check database shows that it last passed the Golden State's emissions test in 1997. Did it drive to Colorado 20 years ago and then sit until a few months ago? There is no easy way to know.
Early Mitsubishi-built Challengers could be had with a 1.6-liter four-cylinder engine, but in 1981 the only engine choice was the Astron 2.6 four-banger, rated at 105 horsepower. Members of the Astron 2.6 family powered everything from Dodge Aries-Ks to Mitsubishi Starions in North America, and production continued nearly into our current century for Chinese-market trucks.
Not many miles on this car, and no rust. The Index of Effluency-winning team at the recent Colorado 24 Hours of Lemons race grabbed a few bits from this car for their somewhat related 1976 Plymouth Arrow, but otherwise it appears that this rare classic may go to the crusher more or less intact.
It's a lightweight, rear-wheel-drive coupe with decent power (for its era) and a 5-speed manual transmission, but there's just not much of a following in Colorado for these cars.
I see the occasional Sapporo or Challenger during my junkyard travels, but the numbers have declined in recent years. Soon they will all be gone.