Drag Racing Tech - what is the hose mod for rear springs?

eibach pro's are coming out with hals going up front and stock springs in the rear. i thought i read somewhere about a hose mod that will let the rear sit a little lower. i'd hate to have the 4x4 look again. thanks.

I just pulled the rear spring isolator out and put a 5/8" hose around the first coil of the spring.