another exhaust question

[hotshotzny]

maybe i have been overlooking it but i do not see any exhaust gaskets listed when im looking at exhaust systems... should you have a gasket of some sort at the joints between the fornt and rear Y pipe and the cat? if so where do i find it cause im not seeing it

 

[Schrade]

My '94 has no gasket at this cat-to-Y joint, either side...