Alternative to a big oxyacetylene tank & torch setup. Bernzomatic OX2550KC for ~$60.
Saw it work this weekend & got all the studs out quickly & without breaking (except for 2 that we couldn't reach because we didn't remove the catalytic converter). The torch is small & fits easily to reach past things. I was really impressed.
http://www.bernzomatic.com/item.html?id=30
http://www.homedepot.com/p/Bernzomat...1673/203391033