I have a leak at the manifold on the driver side. Is there a doughnut gasket there or something? If not I guess I'll try tightening the bolts.

 

There is no gasket to go between the manifold and y-pipe, they use a flange type connection, try tightening the bolts, use some PB penetrating catalist or WD-40 on the bolts about an hour or 2 before you try tightening them, or else you may break the bolts.

 

I found the problem, there was a bolt missing and another bolt halfway out. Some of the other bolts were loose too