When my bro got his first job as an office equipment repairman with a company vehicle in 1971 (at the age of 19) the very last Morris Minor vans (with a 1098cc) engine were being sold on a "J" reg. He got one and in the school holidays I would sometimes go with him on his patch, which was Gloucestershire.
He had a brilliant trick (I thought at age 12, anyway!) which involved coasting down a hill - in gear but with the ignition off - underneath a brick arch railway viaduct in Stroud town he would turn the ignition back on and there would be an almighty backfire like a gun going off!

Everyone would jump out of their skins, but one day he did it and split the silencer from end to end and had to drive home in a deafening roar.
In 1974 the van was replaced with a Bedford HA "Telecom" type van which was much more modern, had a mighty 1256cc engine and a heater that worked! But alas we couldn't get a backfire out of it no matter how we tried.
Come forward to 1976 and I get my first car - a 1957 948cc non split screen Morris Minor car into which my bro put an economy gauge, an oil pressure gauge and an ammeter. I thought I was the dogs wotsits struggling up to 63 mph on the flat, no synchro on first gear , double de-clutching to go into 1st on that sharp left-hander up under the Iron bridge in Bristol, and yes it would backfire like the van!
Happy single days - I even had a 1963 Royal Enfield 500cc sports twin which the mechanic over the road helped me rebuild at the same time!