The CarbonSmith 2015+ Yamaha R1 Frame Diffusers are designed to smooth out the airflow coming through the frame as it enters the airbox. This results in higher net airbox pressure due to less turbulent airflow which creates more power! We measured +1-2% gains everywhere in the RPM band in both HP and TQ. Bolts to the inside frame neck using existing threads Hardware included Tapping original threads in frame may be necessary In order to maintain our extremely high standard of quality products, CarbonSmith parts are not available in mass quantities and are made to order. �Each COMPLETE KIT takes over 20 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!