Anyone running those Powersticks(chambered exhaust)

I have something very similar to what's at the link you posted on my duster.
I got them from summit about 8-9 years ago. I have them with side exit pipes & I like it , but just a little to loud ( I think they would sound real sweet with a rear exit system ) & would rather they come out the back.
I have some original flowmasters that I got REAL cheap & am going to get them done in a to the bumper system when I can afford it.
I honestly think they sound simliar to glasspacks.