How hard is it to get the tubes out of the exhaust manifolds? The nuts on mine seem pretty stuck so I sprayed them down with some B'Laster. They still wouldn't budge. Does this usually take a regimen of spraying them down daily and giving it a try? If so about how long will this take? I am pretty nervous about round off those nuts.

 

Nevermind I got them. Never send an open end wrench to do a line wrench's job.