I just bought a semi-finished project 1941 pickup. The original owner installed a slip fit exhaust system all the way from the headers back and EVERY joint leaks, BAD. I'm 99.9% sure he didn't use any sealer anywhere. I've tried to remove the system and put it back together with sealer, but only the joint at the header will give at all but I can't get any of the other joints apart. Should I go ahead and have a shop weld it all together or is there a trick to getting these joints apart? I don't want to weld the exhaust to the headers, I'll have the shop either keep a slip joint or weld in a bolted joint.