Hello I don’t know if I’m right here I still ask the question a friend of mine wants to buy a part of it I wanted your opinion if this is worth it at all and if the part hurts the engine my well-known drives the 750i mi 450ps he is actually satisfied to the extent he wants to buy the part absolutely the part promises 70ps more so on 520ps Thanks in advance http://www.ebay.de/itm/31844800131?ul_noapp=true