I have the ATS duals also (same as Diesel 5). They look great and have an increase in sound over stock. They do have some drone on the highway and get a little loud when you punch it. They are not a true dual exhaust. The system hooks to the downpipe as a 4" and runs to the mufler as a single pipe. Two 4" pipes come out the rear of the muffler and run to the back. They have a Y look with 24" x 5" pollished tips. I'am very happy with mine. They were going for 1295.(I hope I'am aloud to print that).
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