CarbonSmith has developed a custom tapered velocity stack for the 13-18 CBR500R. �Combined with the Race Pace Air Filter, we have achieved 5% HP gains over the current aftermarket solution. �Manufactured from high strength Fused Filament Carbon Fiber reinforced Nylon which makes them extremely strong, yet flexible and light weight!� These stacks to require you to modify the stack housing by removing some of the plastic that separates the stock stacks. Please read our Terms & Conditions before purchasing, thank you!