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Light weight yet durable, K&N’s Sprint Car Style air box is a must for any racer currently using traditional multi-siamese stacks. Constructed from ultra-light weight carbon fiber and weighing in at just under 3-1/2 lbs, K&N’s Sprint Car Style air box provides ample air flow for your racing needs. New Style Clamp on top and Stack Seals, 360 or 410 Size stack Seals included.