TTI 1 5/8 to 1 3/4 Stepped Headers to 3" Collectors to 3" H Pipe to Dynomax mufflers if I remember correctly. I bought the whole deal from TTI. I did have it run all the way out to the bumper with the TTI Tips but I took them off and dumped it at the axle. It sound way more wicked like it is. It was REALLY tame sounding with the full exhaust and tips, really quite.