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