Larry, you may already be aware of this, but the Dynomax mufflers have been reported to be very loud on this board. One guy warned about this, even with a glasspack.
FWIW, I went with a Borla universal, #40652, 2.25" catback from local muffler shop, stainless resonated tip and stainless high flow resonator (similar to your glasspak I think), for total of around $270 b/f tax. I'm very happy with the results! More power, deep tone, but not too loud or obnoxious. Highway driving does not drone at all.