Well I got my ST200 Airbox/Hose today, and immediately installed it.
It took me around a couple of hours, which included removing the left headlight.
The thing which took me the longest was getting that lower hose installed, squeezing it up between the frame and the windshield cleaner reservoir, and resting the end above the left fog light. If I had a lift, it would of been a lot easier. Other than that, it was straight forward.
Once I got everything installed, including installing a Cobb Air Filter, I started her up to check for any warning lights, and none came on.
I did notice a difference between European and US models, and that's w/the hood stops. With the European model, they are mounted on the upper bumper/radiator frame, near the headlights, while w/the US, they're mounted on the hood.