How many other stabbings do you think happen to people over the age of 20 that include non fatal attacks and not only in the city of london?
I know for a fact that Glasgows knife crime makes london look very tame indeed, And lets not forget the other great citys of Manchester, Nottingham, Birmingham and your 18 dead teens is soon 1000's of knife attacks.
Show me the names of any of the 18 (or what ever the number is up to now) people who have been killed in london this year and i'll show you why what im saying is the truth. The majority of the crimes are committed by a minority of people if you cant see the facts then your being ignorant.
I know what the problem is (in London anyway). Everyone knows what the problem is but im afraid its un pc to say it like it is, Thats why if you read media reports from any of the recent killings (Rob Knox, Jimmy Mizen, Ben Kinsella, David Idowu) you will not see a discription of the attacker. However as shown here http://news.bbc.co.uk/1/hi/england/london/7492210.stm you can have a discription and a photo fit of the suspect. Freedom of speach?
Suzuki hayabusa 180bhp - 220kg (ish) power to weight = 831.32
now for that bmw to have a power to weight that will match that (if the bmw weighed in at 1400kg) it would need to make 1150bhp.