Those are some sweet ideas, it would be cool if they were in the game. But suspensions getting bent probably won't be implemented unless there was body damage. Otherwise it would look pretty stupid if you slam into a wall, and your front suspension is collapsed to half way down the car, but the body of the car is miraculously unharmed.
The rest sound pretty cool, but the failures shouldn't be random, like battle_stage said. The components should fail only if they are pushed to the limit. Such as, redlining for too long, too many miles on the car, tires worn bald, jumping the curb or hitting the wall to hard, that kind of stuff.
Some ideas I came up with:
-Headlight failures-Won't be too easy completing that night enduro now......
-Brake Wear-Brakes get slightly less powerful after each use
-Gas Mileage-Would be much more realistic for enduros
-Engine Heat-If heat rises too high, then wave bye-bye to that $350,000 engine. But, theoretically, the more power you put into an engine, the hotter it will run, because the engine has to work harder. So there would be fewer 1000 Hp Skylines and 3000GTs, with engines, anyway.
And grime and dirt should be implemented, in my opinion. After 30 minutes of racing in real Rallying, you can barely tell what color the car was, or what it is. But after 30 minutes of rally racing in GT3, you have a dull car. Same goes for a 2 Hour endurance race, it is caked with dust and tar in real life, but in GT3.........you have a dull colored car. But this would be hard to implement on the PS2, so maybe in GT5................
.......that would go down well on the last lap of a 2 hour race
