JONSOO

I have a IS250 AWD on 19's. Why is there a difference between AWD springs and RWD springs. Is H&R a quality spring? Will I experience rubbing or vibrations running on 19's with only changing the springs. What other manufacture of springs would you recommend? My car sits up high.

timgs300

iTrader: (22)

I don't know the difference between awd and rwd springs, but they aren't interchangeable. You have to stick with something that indicates it is for awd. H&R is a good name. I think Eibach is really the maker of F Sport, so it's really good.
AWD cars sit higher so you can cut through the snow. Lowering it seems like it would be counter to its' purpose, but definitely would look nicer.

RCB

iTrader: (18)

What are your wheel offsets? This will effect the rubbing at differant ride heights.

JONSOO

I don't remember what the offset is but they sit inside the wheel well.