This x-pipe is unmoddified. I do not have any sound clips but with a magnaflow catback and a flowmaster catback it was not loud but they both sounded very good. I have an offroad x with borla stingers and it is annoying somtimes. This xpipe is in very good condition. And the cats are highflow. It measures 2.5" it is not a stock pipe. I hope this answers your questions. If you have any more you can call me at 919-320-5729.