I am interested in getting one for my YFZ. I race GNCC and trail ride a lot for fun. Has anyone heard this exhaust or felt its power gains. Low to mid is where I would like the gains. Sound in not a concern when racing, but when trail riding - I don't want to be getting headaches or giving everyone else one. Don't get me wrong, I love and aggressive sound, but I have just heard that engine builder's pipes are way to loud for recreational uses. Any thoughts or experience?