CarbonSmith has made a unique set of velocity stacks for the 2019-Current Kawasaki ZX-10R and 2019-2023 ZX-10RR that makes great peak and mid-range power gains! Eliminating the standard 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 CFD testing we are confident that you are buying the most power per dollar with this upgrade! Even with no fuel/spark adjustments, we saw some immediate gains (+2HP) on the dyno- HOWEVER: FOR OPTIMUM GAINS YOU MUST HAVE A CUSTOM TUNE MADE FOR YOUR BIKE. We saw +5 hp at 12k RPM with a proper tune. INCLUDES ONE SET OF FIXED TWO-TIER VELOCITY STACKS INSTALLATION USES OEM HARDWARE WILL NOT WORK WITH 2024+ ZX-10RR WITH VAI (VARIABLE AIR INTAKE) 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. 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 30 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!