I dropped the exhaust on my '94 Camaro over the weekend with lots of PB and WD. Came right off.

Keith

 

I got about 3 out of 8 of the tubes to come off after about 4 hours of fiddling with it. I could probably get the others off, but it was taking more time than it was worth. I did put anti-sieze compound on the 3 before reinstalling them so hopefully if I try again they'll come out easy.