I'm going to post up my experience after installing the Carbonio in my R today. I found very little info before deciding it was the route I wanted to go. Having installed P-flo's on my past 3 cars, I decided I was tired of the sound and also no longer interested in ditching the factory engine cover. Couldn't be happier. The car definitely sounds a little throatier and I instantly noticed a difference the first time I put my foot in it. It definitely improved throttle response and it feels smoother throughout the power band. Could I have gotten more power with one of the competitors products? Absolutely. That being said its exactly what I was after and am 100% satisfied. It's also extremely beautifully built. A little under hood porn.