That was me with the Walker Dynomax Super Turbo. Just recently put one on my Xtra cab truck.
http://board.marlincrawler.com/index.php?topic=102076.0I bought the biggest one they make (case size) for a 2.25" pipe. The bigger the muffler case, the quieter the muffler (all else being equal) and this thing isn't really what you'd call quiet with no cat.