00 V6 muffler

this might be a dumb question, but i rather be safe than sorry, im trying to get my muffler off on my v6 EX, but the nuts on the flanges seem to be locked pretty tight, am i jus not puttin enough of a push to it, or is there a trick to it?

Wd-40

PB blaster...it is a penetrating oil...let is soak overnight...it will do wonders.

thanks for the help!!