Please define "air pipes" for us north american visiters

I have an '87 325es and my hot start is acting up. If my engine is completely cold, it starts strong and instant, but if it is already hot, then I need to give it some gas in order to keep it from cutting out when I try and start it. Any idea what the problem is here? Thanks a lot for any help. My ...

Last year my alternator decided to give up the ghost. There was little or no warning just everything started to go dim until the car stalled out and rolled to a halt.:mad: Today almost a year later I was cleaning out the garage and found that old alternator so I removed the regulator/brush assembly ...