CarbonSmith has made a unique set of velocity stacks for the 2008-2020 Yamaha R6 that makes great peak and mid-range power gains! Eliminating the standard automatic variable velocity stacks and replacing them with our unique fixed two-tier velocity stack system has resulted in some impressive gains! After a metric shit-ton of dyno testing against the Graves, OEM, and Ours, we are confident that you are buying the most power per dollar with this upgrade! Even with no fuel/spark adjustments, we saw some gains - HOWEVER: FOR OPTIMUM GAINS YOU MUST HAVE A CUSTOM TUNE MADE FOR YOUR BIKE. 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. INCLUDES ONE SET OF FIXED TWO-TIER VELOCITY STACKS INCLUDES 6 NEW M5 BOLTS ELIMINATES THE OEM ADJUSTABLE VELOCITY STACK MECHANISMS COMPLETELY 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 28 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!