what company offers the lowest drop springs? tanabe, trd, eibach, etc?? i tried looking up drop rates and its different everywhere so i decided to ask here for some information. thanks in advance..

Try this:
2008 Scion xB Lowering Spring Comparison (http://newscionxb.com/scion_xb_performance/2008_scion_xb_lowering_spring_comparison-t643.0.html)

good looking out. thank you!