I previously tested with 2 Dynomax Vortex cones in the tailpipe and was able to get the Db down to 96.6. I just pulled out all of my exhaust so that I can move them to the front of the intermediate pipe. Unfortunately, I don't think it made a difference.
While I was in there I tried to fit a bullet muffler in, but it won't fit. I am about out of options. Hopefully the cones did their job. Other wise I will have to take some more drastic measures.