AAs title says racechip ultimate for 50i V8 for sell. I know this will work on any bmw 550i since they are same engine as my x5 50i . Absolutely no problems with it .I am going to upgrade with BPC tuning stage 1/2 so will need to sell the racechip. The piggyback is in perfect shape with no issues at all.Will ship in US only via ups. $400 shipped