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If you have access to an acetylene/oxygen welding kit or know an HVAC guy with a small portable setup you could borrow, it would be a big help getting rusted exhaust nuts off.
Heat them up glowing red hot with a brazing tip then turn off the torch and put it down. Put a wrench on the nut while still glowing a dark red a little bit and they usually twist off easily with a short squeak without breaking the stud.
If that doesn't want to work, turn up the gas or use a cutting tip and burn off one side of the rusted nut without burning the stud and it will come off.
Put copaslip antisieze (the best) or alumaslip on the new nuts when installing them.
I have heard 8mm stainless steel exhaust studs may not hold over the long run but there are some out there that say they will. Probably depends on the alloy they are made of.
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