The pretty standard stuff for a normally aspirated Crossfire are:
Cold Air Intake
Injectors
ECU Tune

TVT Design sells a couple kits that basically combine those things. Or you can part it out separately.

Also, it's always a good idea to put in some quality high temp brake fluid and stainless steel brake lines. Not that the XF brakes are bad. It's just a good idea to do to any car you intend on driving hard.