Well like I stated before I was tired of my stingers, everyone had them and I heard about this m55 thing. I did not believe that it was any louder than the stingers or the slp. My car still hasnt been tuned so I was limited to what I can do, but let me tell you :uh oh: They are loud and I dont recommend them for an every day driver. At idle the car sounds like its cammed, just a nasty low grunt. I was only able to take it around the block in first gear and rev it a couple of times. I would compare the sound the a sebring/lemans racer, its not your typical mustang sound which is what I like. You might as well throw your radio out the door cause you cant hear shit. This thing sounds mean as hell. Several people working in neighboring bays came out inquiring what the f*ck was that that just drove by, that made me happy and proud. Ive heard the stingers and slp and this is by far the loudest exhaust I have heard, 10 fold and 10 times. :banana: I honestly dont recommed this for an everyday driver. I will video record the dyno session, but it will do it no justice. This is great. :thumbsup: