I install jdm ebay 30.4mm front AND rear sway bar on my ap2 s2000 2005. First, cheap price (289$ plus shipping and absolutely beautiful red paint). Fit is perfect and another mod you can do on driveway stand jack if you like it!!! Reallity: front upgrade is very nice, rear: the more you got bigger, the more your rear end will snap, really snap, not modestly (remember that i have superbe bridgestone RE-11 225 front and 255 rear) after install this (front and rear, in straight line, its really perfect but in turn, the rear ''upgrade'' is a big problem, with my RE-11, the rear snap like if i used really cheap non-adhesive tire, really bad and at really low speed on corner. After this, i re-install my oem rear sway bar and keep front jdm 30.4 mm and its a real upgrade over stock set-up (remember i keep my stock coil and shock but with only 30 000 miles). Reality fact, the s2000 can be upgrade in front sway bar but the rear need to be smooth, if not, SNAPPPPP OVER-STEER IS WELCOME!!!