so the rattling of the exhaust from the tiico engine was just too much for
my cat and it broke entirely off where it joins to the exhaust.  i've
pulled the cat out but can't seem to unscrew the o2 sensor off the cat.
does it just screw right off?  am i better off just getting a new 02
sensor?  and to top it all off i just realized that i was sent the wrong
cat!  any help is greatly appreciated.  thanks!

ki