Exhaust leak, did I forget a gasket? (picture)

[apzak]

When I put my stock headers/exhaust back on I'm not sure if I forgot a gasket between the header (1) and front pipe/primary cat (4). I did not put a gasket there because I never remember one being there, and this image doesnt show a gasket. However my exhaust is loud which means it's leaking someplace. Here is a picture:

[Altiman94]

did you listen to the car underneath it with it running? That'll help you pinpoint the leak.

[S14Life]

plug the tail pipe with sme rags and then listen for the leak.

[GEO]

Just put sopay water on all the connections to see which one bubbles.

[fiznat]

I was looking at that just the other day when I sold my stock exhaust, and to be honest I dont think there is a gasket in there. The pipes sorta mate together male/female with that little lip one of them has... I could be wrong too but I really really dont remember seeing either a gasket there or an impression from a gasket on the pipe later on....