Installed a OS giken LSD and tried some RE71RS. Was able to PB with a 22.0 multiple times but couldnt crack into the 21s. Switched to used Nankang CRS 255/35/18 midday and was within a couple tenths of the RE71RS times but the heavier wheels/tires was slower out of the hairpins from what I can see

With RE71RS I seem to have some fuel starvation problems if running half tank or less. I have a weird stutter after turn 4 which probably cost me the 21.9 

245/40/17 RE71RS
MCS 1way 7k/9k Tuned by Shaftworks
OS Giken LSD Tuned by Shaftworks
FDF Rear suspension arms
Perrin front/rear swaybar
CSG Catback
Performance Pack Brembo w/ Raybestos ST43
Alibaba Wing
Colorfitting Oil Cooler
Infinity Design Intake
CSG E85 Tune
4.5F/2.8R camber