Sorry to resurrect an old thread... hope nobody minds but I thought I would contribute and this thread looked like the best place to post my new springs installation.
Anyway, just installed a set of Tein H.Tech lowering springs. Garage Five - a specialty auto installer here did them for me. Apparently, when installing these springs, they had to remove about 1.5cm off the front bump stops, but didn't have to do anything on the rear stops.
The drop is not that significant compared to others, but more then enough for me. Handling and overall suspension feel is excellent. Much better than the stock springs but just as comfortable. Totally worth the upgrade and highly recommended for anyone who doesn't want a significant drop and at the same time upgrading to a firmer stock suspension feel.
Right now, my plan is to drive around for the next 500km on my old rims and tires and hopefully the springs will settle by then. After, I'll install my new rims/tires and bring the car into the dealer for a wheel alignment.
Here is the front springs installed
Here is the rear springs installed