riv sounds a bit like a diesel

Hey all. Here's a vid of my car at idle. It sounds quite a bit like a diesel.

I saw some smoke coming out of the exhaust pipe near the headers when I throttled the motor (it looks like there might be a crack in the piping)

Does this sound like an exhaust leak?

I saw some exhaust smoke coming out of the back of the motor too, so there is a high possibility there is an exhaust leak.

From what I've read, its not uncommon for the exhaust manifolds to get small cracks in them over time. Never experienced this first hand but have also read it creates a ticking sound which can be picked up as false knock by the knock sensors.