Upgrading the muffler will be a good step, but upgrading the 3 1/2'' down pipe to 4'' would be a good move too. So a 4'' TBE kit is probably your best bet, but as far as muffler choices, I cannot help.
As for the Edge EZ, I like it as a stack, but for about the same money, the Smarty JR would be worth looking into IMO.
As for the Edge EZ, I like it as a stack, but for about the same money, the Smarty JR would be worth looking into IMO.