Installed this exhaust on my YZ250F, love it! I had it tested a couple months ago, and as it came out of the box with the Quiet Core S/A insert and the MX tip installed, it registered 88dB! The Trail Officer was quite surprised; he even tested it again o the same result. This isn't even with the Trail Saver Quiet Core installed, as in soco3594's second picture. It's amazing the amount of tuning options they offer for the Lexx, you can run it wide open with 3 different sized end tips, with just an optional S/A screen if you don't need the entire quiet core, etc.