This direct bolt-on kit adds 5° of ignition timing for improved acceleration and increased top end MPH. The dual-sensor design lets you easily switch between 5° advanced timing and stock timing by simply swapping a plug. Premium 91-93 octane fuel is required when running the 5° advance setting. Switch back to stock timing when running REC-90 or lower-quality fuel. Fits 200/250/300/300R/450/500R
