Tony, get Simon for Upsolute. www.ccctech.co.uk. He will come to you and install the chip. It will give you 20 more ponies and 15 more ft/lb of torque. Guy does good work and lives down south. He travel up to scotland to do my car. I highly reccommend him.

Superchip will not do a xf. I even e-mail stating that it is the same ecu as the slk320 but, they refused.