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Yes But they have different plug ins on the throttle body so you will have to you will have to swap the throttle body also
Throttle body spacers increase the air volume between the engine and the throttle body.
It is located on the outside of the throttle body in line with the butterfly. Remove the air intake from the throttle body and it will be accessable on the back side of the throttle body. Easier to work on if you remove the throttle body. Easier to clean it too.
The starter is hidden under the throttle body. Also very hard to get to, not to mention hard to see. I'd recommend having a professional do the dirty work.
No, the throttle body and multi port heads are not interchangeable.No, the throttle body and multi port heads are not interchangeable.
I'm not sure about your 1989 model but on my 1993 300E the rear headrests are raised manually but lowered by a switch on the dashboard. Since they are both 124 series I would think yours would work the same.
On the engine inline with the air intake duct work.
Yes, throttle body spacers do really work, however, it typically depends on the specific engine involved as they work better on some engines than others. Their function is simply to alter the airflow into the intake manifold.
On a centrifugal supercharger(Paxton, vortech, procharger-yes. On a whipple /eaton- no because they are located between the throttle body and engine, BOV only work when the throttle body is between the supercharger and engine.
It is possible. Try cleaning your throttle body. If this does not work, search for vacuum leaks in your intake. Then check your idle speed at operating temperatures.
Nope
follow the air induction to the throttle body. it is right behind it in front of the fire wall. good luck I believe this model is the same as the 95. In that case, pull the throttle body off first. 4 8mm bolts and it is very easy to work on. You don't have to disconnect the accelerator cable, you can just move the TB to the side. There are 2 screws that hold it in place. You should also replace the gasket for the TB.