I had it installed on Friday along with a stainless 5" tip. It is 24" long, 4" in and out, and has an offset like the stock muffler. It is a strait through design with louvers around the center tube and no packing. Initial impressions are pretty good. Idle only slightly louder than stock. Any time you rev it, take off, or get into the pedal at all the exhaust is noticeably but not excessively loud. I has a nice deep sound and does not appear to be raspy or tinny sounding. It sounds a lot more like a real diesel now.