K&N Custom Racing Assembly Carbon Fiber Air Box - Large Solid Base OnlyK&N's carbon fiber composites have an attractive cosmetic appeal, and the outstanding stiffness to weight ratio that is needed to stay competitive in today's racing industry. Carbon fiber composites have taken the method traditionally associated with fiberglass and perfected it to a precise science with outstanding performance as the result. K&N's carbon fiber composites have an attractive cosmetic appeal, and the outstanding stiffness to weight ratio