So the indie who has been helping me look for a used Mercedes for more than 16 months now offered to sell his E220, as he was getting a 2008 E class and didn't really have enough storage space to keep it. Apparently, he swapped the transmission with one from an E270 donor car for the purpose of higher torque and better fuel economy. He has assured me that the ECU has been adjusted accordingly to accept the new transmission. Should i consider buying it (He has been giving a realistic sense of owning a Mercedes in India ). I'm worried that the car's electronics might freak out at some point down the line despite their careful tuning/remapping of the ECU and malfunction in a time I can't afford it to malfunction. I'm worried that this might make the car BMW 850i bad, but is that my paranoia talking?