Ball joint on the driver's side was busted when I bought the car. Made a horrible noise and took out all fun from driving. Very easy and cheap to fix.
Both front wheel bearings were worn out and noisy, changed them. No biggie.
Power steering was sticky, changed the belt -> OK.
Engine mounts have worn too much, this needs to be fixed. Affects transmission and exhaust mountings (broken because the engine moves too much).
A very, very fast car. Still great looks after all these years, a true classic.
People seem to be afraid of old Mi16's, so they are cheap. Just check the car well before you buy it. Can have tedious electric problems, but the mechanics and chassis work. 405's don't rust.
I love the engine. My engine was overhauled completely at 300000 km. This is a pure race engine, it wakes up at 4000rpm and then it's pure joy.
If taken care of, this car is reliable. Interior is very comfortable and durable. But who cares. It handles well and it's fast. And it's a looker.