Flowmaster drone solved.

VOETOM said
It'll be little noisy but not bad on the slant six.

What I'm after is flow. I have the exhaust manifold outlet enlarged to 2 1/4 all the way in. I am hoping with the TTI 2.5" exhaust and that Ultra Flo muffler, it'll help it out a little more. I'm hoping it won't be aggravating.