Thanks for the nice comments about the wagon.
To answer your questions:
I won the engine on Ebay and that just happened to be the winning bid of $510.00. I thought it was cool.
I have two 200SX intakes, one that is mostly stock with only the EGR removed that has the red cover. This one included the idle control valve and fast idle and has the stock Red cover. The other has been modified to remove the idle control, EGR and moved the fast idle to the other side and has the shiny cover. This was on the car when I bought it and the idle was not good. Since I have AC on the car, I wanted to used the Idle control to help stabilize the idle when the compressor is running.
The shiny cover still needs alot of work to look good in person.