I have the Mistral pipes on my V11 and they are quite adequate but I cannot compare then to anything other than the stock pipes. I have tried the Mistral crossover and the Stucchi crossover. The Mistral gives a very fat midrange but cuts the top end power. I really enjoy the Mistral for touring. The Stucchi is more suited to optimum top end power so if you feel the need for the most speed this may be the way to go. You will need a Power Commander or equivalent to optimize the performance of whichever setup you decide upon. Most of all , I enjoy the sound of loud pipes.