I have a dansk muffler with the "super sound tips" (not the one that looks like a sausage), and it does not resonate at all. It is shaped like the OEM muffler.
The sound is not as aggresive as the GHL though, so be aware that you'll only get a modest increase in sound after 4k rpms. Otherwise, it sounds similar to stock, except that it is deeper and a bit throatier.
http://www.************************************************************/product.asp?pf%5Fid=P914200&dept%5Fid=4577