im trying to install my cat back exhaust and i cant get the bolts off, at the intermediate pipe, ive tried wd-40, Gunks liquid wrench, and all the brute force and hammers ive got it just wont budge should i just buy a new cat or take my car to an exhaust shop and have them install it.

 

pb spray is the stuff... you are tring to turn the nut right?... on the side that has 3 bolts.. they are a part of the cat and the bolts cant be taken off.. just the nuts

 

yeah yeah sorry the three bolt side and just the nuts. i think they may be rusted into one peice.