~ Eccentric design moves steering rack forward slightly ~ Prevents over centering of tie rod and knuckle to prevent heavy steering at lock ~ Takes ackerman curve from digressive to progressive difference while decreasing overall ackerman ~ Gold anodized aluminum construction ~ For S13 steering rack tubes which are 48mm OD ~ install pix: http://partsshopmax.com/e107_plugins/forum/forum_viewtopic.php?4772.40 **Install note: Overtightening passenger side mount can crush stering rack tube. Carefully snug passenger side rack mount. You will tighten the driver side mount around the cast portion of the rack firmly to secure rack in place.