Yes - I bought my SupaLoy control arms via APR so I got the adjustable ball joints
Ideally you replace the adjustable bolts/nuts with OEM ones cos they are much stronger
I had the adjustment maxed out and got 1.45 deg negative camber
This has improved/increased the car turn in and cornering grip
I can even brake and turn in without complaint from the car (running dam good tyres however)