Having trigger and rpm issues with your RB? The factory optical sensor can be troublesome when increasing power and using faster modern ecus. This modification is done on your sensor so you will need to send it to us. It will get cleaned, new bearings, a 24 slot trigger disc and sent back to you. Settings will need to be changed in the ecu, timing re set, and tuned checked. This will not work with factory ecu, Nistune and Power FC. All modern ecus such as Haltech, Link, Vipec are fine.