73' B3 340 Duster pro touring build

My biggest curiosity is if it sounds like open headers like that. I have mine after the X and it doesn't sound the same as it does with open headers and would like to get that sound out if them.
I would say it's pretty darn close to open headers, maybe some of the people under the HDK tent (Denny, Mark, Rod, John ect...) will be add there opinion on how close to open headers it sounds.