--Car and Driver, 29th Annual New Car Guide (2000), page 37, Technical Highlight: NissanThe Altima has been fitted with struts with acceleration-sensitive damping. The struts, designed by Monroe, feature a spring-loaded sliding valve with a conventional damping orifice at it's end. When verticle acceleration of the wheel exceeds 0.50 g-when it hits a large bump or pothole, for instance-the mass of the valve act against the spring opening up an oil-flow bypass that reduces compression damping. Nissan claims the struts allow firm body control while reducing ride harshness over rough pavement.
According to my brochure, I don't have these on my 2000 Altima. It says that they're on models with 16-in tires and I got a GXE with the 15-in steelies. Question, is it worth it to upgrade to these struts?