It's true. I have TORS, K&N under seat filter and PCV. I had it dynoed by a popular shop that dynos mostly Triumph/BMW/Ducati bikes. My 2014 runs great and actually much better than the TORS download. My only problem is I expected higher numbers from the dyno. I got 131 HP and 146 LBS. Not bad but not what I expected. Don't get me wrong as the Rocket runs fantastic but you need the tuneecu if you want higher numbers. I am in fact glad I got it tuned as it also fixed a little of the first gear lash.