Exhaust manifold leaks

I would start with an exhaust manifold gasket set, it is fairly cheap and an easy task to place them on the passenger side.
As far as the rattle with the heat riser, you can wire it open to stop the rattle. It would not stop an exhaust leak, but would stop the rattle so that you could isolate the leak perhaps.
C

Thanks. The manifold gasket is less than a year old. I was thinking about something like that to stop it from rattling. I would just need to make sure it is in the right direction.