All I can say is WOW My 60 foot times will definitely improve. No more wheel hop or having the axle just feather the ground after the launch. It really launches hard now. Anyone with a lowered car should do this ASAP.

great news man
even on non-lowered cars, i've heard they make a difference
i think i need some, i'm getting some nasty wheel hop

How hard were they to replace?

I was using a drive on lift, and it took me 20 minutes from start to finish to install both brackets and replace LCA's. Even if you don't have access to a lift, it shouldn't take you long at all. Make sure you chock the wheels, because the axle will try to shift if you don't.