Pipe has single weld in expansion chamber, they told me it would be about 1/2 lb. heavier than stock, which it was roughly. The tail pipe looks the same so I figured a new internal taper pipe was added between the tail pipe and exit taper? Pipe is coated and was much quieter than stock with the PPP muffler. I called and asked if something was wrong do to the sound, and that this was an added benefit of the mod. I have another stock pipe so I will do a few measurements, but looks to be the same lg. as fitment was unchanged. Mike