ah, the back seat of a mini, good memories!
Mind you mine was a 1964 one, bright orange, with flared arches, twin carbs that used to race too fast sometimes and I had to use a screwdriver on them to slow them down, racing gearbox, bucket seats and generally Cooperised.I was the bees knees when I was 18!
I thought the big bore exhaust was supposed to sound like that until the Police pulled me over, escorted me home and told me not to drive it again until the big hole was repaired.... I would love to have another Mini