CARBONSMITH HAS DEVELOPED AN AMAZING VELOCITY STACK KIT FOR THE 2021+ SUZUKI HAYABUSA. THIS KIT INCLUDES A LEFT AND RIGHT VELOCITY STACK SET DESIGNED FOR OPTIMUM AIR/FUEL MIXTURE ACROSS THE ENTIRE RPM RANGE COMBINED WITH CORRECT TUNING. MANUFACTURED WITH NYLON EMBEDDED CARBON FIBER REINFORCED WITH CONTINUOUS CARBON FIBER. �THIS MAKES THEM EXTREMELY STRONG, LIGHTWEIGHT, YET FLEXIBLE AND VERY RESISTANT TO HEAT AND CHEMICALS. �THESE SHOULD ONLY BE INSTALLED BY A PROFESSIONAL. OVER +12 HP GAINS AT 10,700 RPM AND NO MID RANGE LOSSES!!! OPTIONAL DIMPLE TEXTURE CREATES ADDITIONAL TQ AND HP FROM 3-8.5K RPM. EQUAL LENGTH RACE VERSION EXTENDS RPM GAINS WITH MINOR MID RANGE SACRIFICE STAGGERED STREET VERSION HAS SLIGHTLY MORE MID RANGE POWER WITH LESS TOP END POWER INCLUDES LEFT AND RIGHT STACK SET INCLUDES NEW HARDWARE FOR STACK SET RESULTS WILL VARY DEPENDING ON ENGINE BUILD AND TUNING CAPABILITIES NO HEAT DEFLECTION UNDER 300 DEGREES F WILL NOT DEFORM FROM HARSH RACE FUELS OR NITROUS In order to maintain our extremely high standard of quality products, CarbonSmith VELOCITY STACKS are not available in mass quantities and are made to order. �Each KIT takes over 40 hours of print time and are MADE TO ORDER , therefore your patience is very much appreciated. PLEASE READ OUR TERMS & CONDITIONS BEFORE PURCHASING, THANK YOU!