I posted my experience (or the few bits of it) with the falken st115. Also, price wise, this is the price that I got when I changed my yokohama ad07 15" to my falken st115 14".
http://img3.imagebanana.com/img/aete4oo1/tiidaproto1_1.jpg
The Tiida S-Tune PROTO concept featured a subtle bodykit that included front and rear aprons, spoilers and NISMO livery along with new alloy-wheels. NISMO...