Ignorance is bliss.. Of course it makes a difference it's been done you're not the first and no it's still the same way but with the advancement of computer controlled controllers, it's still water and methanol being injected in an engine the principle hasn't changed. It's a small gimmick system...
Lol not sure they can claim first production car with water injection, Chrysler had it way back in 1962 with the 1962 Oldsmobile F85 and so did Saab with the 1978 99 Turbo, and wouldn't be surprised if there more.. Guess it's a marketing gimmick as Water/meth is well known in the tuning/modding...