"eifel"
 

I'm new here and I have a 03 legacy wagon 2.0L GT spec B, straight out of japan my first Subaru:luxhello:!!! as far as I know it's stock but it has a black box in the glove compartment with a sticker "eifel prova concept of nurburgring" and it's wired to the ecu. can anybody enlighten me on this and what is the advantages of having it and what I can do with it?