Changing the PCV valve on your Subaru XV Crosstrek (or Impreza) is part of your recommended 30,000 mile maintenance.
Disabling the Subaru XV Crosstrek lock sound
The audible chirp when my XV Crosstrek is locked or unlocked is quite annoying -- worse is when someone hasn't closed the door completely yet and it beeps 5 times.
The stock Subaru 5-speed shift knob is rubbery and terrible. I decided to drop $40 on eBay for an OEM weighted leather knob.
Finding guides