Gabro Racing V4 Velocity Stacks Kit - VA-V4Stacks
Complete fitment list at bottom of this page.
As the attached dyno graph shows, these 3d printed carbon reinforced nylon velocity stacks improve horsepower, and to a greater extent torque, throughout the rev range.
For owners with the UpMap module for '17-'20 RSV4, '19-'20 RSV4 1100 Factory, or '21 Spec RSV4 1100 (all varaints), this kit comes with a code card that allows you to download dedicated mapping for use of these stacks from the UpMap Ap.
Installation instructions in .pdf format