07 nissan murano sl catalytic converter??

had the car towed home, the driver said to the wife the code was catalist
pressure to high/low cant remember he dropped it off and felt the exaust tip
hardly no pressure
problems:
:idles/ revs fine

: exaust pressure low on the tips : the pipe was rotted off from the muffler
seems like it gets good pressure, gasses feels warm not hot

:shift into gear: no rev no go. pulled it off the tow truck and let it sit started it
up and took off like a bat out of hell, next morning started it up and no rev no
go in gear. my friend made a lire out of me it was still running he tore out like
a bat out of hell, i did the same, about 10 minutes later i tried again no rev no
go then it stalled. any ideas????

battery light came on, new battery had to jump it and belt squeel which has
been going on for a few days thinking power steering, along wit hard to turn
steering wheel at first then loosens up