Gaskets on wastegate

[Randall Cohen]

Just finished removing the wastegate, accordion and finally got the motor mount off.  Nothing beats PB blaster for making hardware come apart.  Found no gaskets between manifold and WG, WG and accordion, and acordian and downpipe.  Found a minor carbon trail on accordion at downpipe side, probably my exhaust leak.  Are there supposed to be any gaskets on these connections?  If not, should I use any sealer?  
BTW, what is the easier way to remove a downpipe on an 80 QT?  Intake is still on.  Looks like down is better than up, but neither looks easy.