Since you uncorked the headers, whatever exhaust you get will be quite loud especially if it replaces the 2nd resonator closest to the muffler.
I wouldnt expect too much or if any gains in power, but it sure is going to sound great.
"To my seeds, may I lead you into no breed of evil. In the categories and stories I breed my sequel.
You know the money brews, blunts, and broken 22's. Monkey see, monkey do, shorty sipping sunny dew.."