on my 1977 120Y 4 door sedan known as "The Defect" the exhaust didn't fall off, I I cut it off half a metre after the bit where it straightens up to go under the floor and stuck a hotdog in the recess under the passenger reat
it has a blown head gasket (gotta get around to fix it
and I found the hotdog on an old seized motor in the shed
top speed went from 75 Kph too 100
later
Mawler1