FRS/BRZ/GT86/GR86
Billet 6061 Aircraft Grade Aluminum Spacer is designed to reduce the over extension of your CV Axles on lowered vehicles. This problem is a bit worse on the Left CV axle as the differential sits slightly further to the Right side of the vehicle. 
When the vehicle is lowered the axle angle changes and stretches the axles to be longer than normal which causes the inner CV Joint to have less area to grab and fails more often.