You're right...it doesn't change the pinion angle...changes instant center...IMO DON'T DO IT!!...I put them on my car because it was lowered and I thought they would bring the instant center back to where it should
be...long story short...the car wouldn't 60ft worth a crap after I put them on...they're gone now...after 2 years of frustration...and oh yeah a lot of money...just leave the lowers where they are...in the stock mounting locations...