Both look good.
You got a video recording of the squeaks and rattles? What year is your vehicle? How many miles?Okay that what I thought cause she squeaks when she accelerates but she old I notice a rattle too so I'm just check major components before I cause exhaust but I'm thing the cat is really gone now
Could be a lose heat shield. Regarding the CAT, are you getting the notorious P0402?It only happens if the engine is at a certain load like if the transmission is in gear and I accelracte or if a/c is on and I'm just idle or if I'm idle and turning the wheel. I'm really thinking it not the transmission but the cat probably broke apart like I been having a code for the cat for a while