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.
"This vagabond life can I transcend? To give up sleeping beneath the stars. Life on life’s terms does not pretend.
This journey fades as I near the end. The long sleep under Venus and Mars.."