I also have Allen's exhaust on mine. I replaced old/tired flow masters. I probably liked the flowmasters better on idle, but on highway with the chambered; I did get exactly what I wanted; throaty/raw music that screams power.
They are loud (louder than flowmasters) and I have also triggered car alarm systems in parking lots (which is kind of fun)...
Came with all the clamps, hangers and nice chromed tips. I had it installed at a local shop since I was replacing my headers at the same time and I don't do welding.
Note on this (in case you do similar); if you are replacing the headers at the same time and get black painted ones; there's a "burn in" procedure to follow. I was not aware of it and did not follow it. Within 30 minutes, smoke came out of the hood; the paint of the headers pretty much all burned. So brand new headers looked like 15 years old headers on the first drive and a few months later (without protective coating); were covered in surface rust.
Steph.