K&N High Performance YA8514 Reusable Paper Engine Air Filter Replacement Filter for 2014-2019 Yamaha

2014 Yamaha FZ-09 Installation was easy, minus the minor surgery of removing the side scoop covers and gas tank to get to the air box. (BTW, you don't have to disconnect the fuel line, only the vacuum hoses and electrical connector. Simply put a towel over the rear body work to prevent scratching, and you can turn the tank around 180 degrees to get it out of your way.)The filter slipped right into place and the cover went back on smoothly. Upon starting the bike, there was a noticeable difference in sound (stock exhaust) which I didn't expect. It sounds a little throatier. On the first ride, the difference was definitely noticeable. The throttle response was crisp, and it pulled harder through the RPM range than stock. I recently had the stock ECU re-flashed by the dealer to the 2015 factory spec which still maintains all the emissions standards, but smooths out the herky-jerky first 1/4 throttle response, and the power delivery is that much more enjoyable, plentiful, and fun to ride. Standard mode feels more like A-mode, and A-mode is quite beastly now. With warm dry roads and weather, B-mode has not been tested yet. I would recommend this to anyone before spending a ton of money on an aftermarket exhaust. I would be interested to see dyno No.'s which I could not find on this site.