Yeah it adds like 1.0-1.2 deg camber.
I'm sitting at -3.7 deg up front with 034 lowering springs, 034 camber plates, and the ball joints. And the car is worse than OEM springs with just the camber plates + offset LCA bushings.
For autocross only the bump steer is probably manageable. I'm actually going to be running them this weekend before taking them off.
But the amount of bump steer is BAD. Like you gain -0.50 deg of toe out PER SIDE in only 1in of bump travel.
Every single time you hit any kind of bump, your toe is going absolutely wild.
Plain and simple you cannot do roll center correction without also addressing bump steer. Adding camber alone is great (and is why I bought them in the first place). I was hoping the bump steer wouldn't be too bad. But it's fucking awful.
While I've not measured it out just yet, due to the angle of the ball stud in our knuckles, as you extend roll center with the ball joints it also screws with ackerman. Essentially steering the inside tire further than it should to align with the outside tire vs the rear axle centerline.
Hitting the outside curb in T10 at VIR essentially self-steers the entire car back to the left.
I've not used their lower control arms, but those supposedly give the same -1.2 deg of camber. And will be without fucking the rest of the geometry up.