Hi, I had a genuine remap done to my 3.0 V6 diesel XF. Result is incredible! Turbo kicks in at lower revs with more pressure. Added about 60BHP to the standard 240. With the Jag (same with a Volvo D5 I did the same to) you have to have the ECU removed unlike many cars where you can plug into the OBD port. A mobile guy came to the house and did it at my kitchen table. £350 worth spending