The difference is about $150+....
the red and black are standard relays... mechanical coil for high currant switching... costs about $15-$25.
the yellow is a very expensive integrated circuit relay.... with mechanical contacts. It is specific to the turbo and its application for fast switching...
pelican sells it.. but you have to call them and tell then that is what you are looking for as it is special priced and ordered.
1987 930 -Guards Red
2001 740I sport Blk
2011 F-150 supercrew Blk
2014 X3 2.8 white
"What goes around comes around..."