I'm also interested in the grey rear seats if you're willing to ship them. I'll cover the cost of shipping!

Friction modifier should only be added to the rear diff if the rear diff is locking hard enough to make noise or 'hop' on normal street turns. Friction modifier is literally additional oil that reduces how much your diff is locking up to compensate for locking up too hard. It was invented to make mo...

GTS rear end/LSD?