I bought the MINI B46 / B48 (4 cylinder) Stage1 BETA kit from Burger Tuning. I don't have access to a dyno so I could only go by feel. It did seem to have a power gain so I was happy. But, a couple of days later the engine began to cut out intermittantly. I replugged the kit only using the TMAP connector and that worked for one day. Then I got a transmission error message. I contacted Burger Tuning and was told it was not compatible with my 2014 Cooper S. I have a 2014 Cooper S (F56 with B48 motor).