Unfortunately those nuts tend to rust on. Plenty of oil and a tight 6 point socket. If you don't round off the edges on the nut then you just have to keep applying pressure until you either get the nut loose or the stud comes out or the nut breaks off. You have to loosen the bolt that holds the down pipe to the bracket on the bell housing like suppra_girl said. You may have to loosen the nuts on the manifold to get it to move out and get you more room to those three nuts.
If all else fails you can unbolt the cat converter from the front end and take the manifold bolts off and pull that part of the exhuast out of the car. The will give the the option of using a torch on the nuts and get them off that way.
Good luck and keep us informed.
Russ
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