Just picked up my car from RPI with the prototype exhaust on. From my initial drive, the car really does seems to pull a little harder. I'm going to get my car dyno'd this weekend so we should have some numbers up soon. As for the sound, its not very loud but it sounds mean! I have a video clip i took on my Droid X but I need to edit it before i can post it. If anyone can suggest a good program to edit 3GPP movie files that would help me get the video up sooner. If anyone is in the market for an exhaust for their X6M, I really suggest you hold off to see RPI's finished product before you go buying an exhaust. Build quality is excellent and they use only the best materials and have awesome craftsmanship. Sorry, but I can't give any further details or close up pictures since this is still the prototype. Keep in mind that this is the PROTOTYPE and NOT the finished product. Finished exhaust will be polished and look a lot cleaner. For now, here's a teaser pic. Video of sound and launch to follow as soon as I can edit the video file.