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Key to any engine's performance personality is the cylinder head, and the X302 has plenty of charm thanks to the nice X306 aluminum assembly. This is the latest development of FRPP's bolt-on GT-40 head, often referred to as the GT-40X or Turbo Swirl. It's designed to give maximum performance in a durable, bolt-on architecture, and compares well with other bolt-on heads. At 22 pounds per assembled head, a pair of these shaves 50 pounds off the nose of your Fox.