i understand subframe spacers reduce wheel hop. but does it also reduce the leaning of the body of the car. like for instance when going up a speedbump sideways, my car's body tends to make creaking noises like its twisting, would subframe spacers reduce this 'body twist'?

 

I don't think they would, all they do is take the slack up that you have in between the subframe and the frame of the car its self to reduce the travel of the subframe. Strut tower braces reduce chassis flex.

 

Subframe spacers won't help you out with this problem.