which gasket

my exhaust is leaking causing fumes inside car
but not sure which gasket im asking for, pic ot brill as taken laid under car , its joint thts just to left of oil filter if that makes sense

I cant make it out, could be where Manifold meets Up pipe, or it could be joint on manifold.
Try get a better pic up, maybe zoom out a bit so we can see more and identify where your at...
Regardless, you could be just aswell to buy all the gaskets and replace, to open that joint yu are probablly looking at breaking the Manifolt to up pipe joint, and removing manifold from heads... so thats
1 x Manifold to Upipe gasket
2 x Manifold to heads gaskets
+ Whatever gasket you need to repair.. think there is only 2 more left to replace any way.