surley its only a bit of computer jiggery and a better exhaust that makes the sport more powerful than your 1.5. thats the only difference between the new mini one and the cooper
when i thrash mine its about 10 secs but that's still pretty ok. had a look on your is by the way - pretty neat. looks good that low (mine is one of the tall newer ones. it's ok because the suspension is quite hard so the ride doesn't get to wobbly)