360 Smoke near transmission/cats

Driving quite spirited and for quite some time. Got kind of a decent amount of smoke and almost immediately I let off the gas and it went away mostly. Then didn’t see any smoke as I took it pretty easy coming home and then this is after turning off the motor.

Thoughts for possible causes? If those cats weren’t there, I feel I could have found it.

thanks in advance for any ideas or help

 

Did you get an overheat on the cats? Could you be dumping excess fuel into the cats?

 

No notifications, no symptoms other than smoke.

I did want to follow up with it kind of looks like hardened gear oil spots…. Location is odd for me though being a new owner.
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First pic appears to be rust dripping from exhaust bolt.. Next pics, check the CV boot for a tear or leak..

 

concur, I was going for those black drops next to it. Those were actually wet.

yeah CV boot, roger that.. doing some brake work soon so will check it out. If it flung some grease that would make sense due to the dark black spots and that little puddle of black oil/grease