Your right but I thought I'd give this ago anyway. It cost me a fraction over 100bux and it works quite well.
Obviously I haven't needed to retune since the new edition either.
I have fitted this just assist in keeping iat's down (which it does) yet not run into any dramas should I run out of water since it has not been tuned with it.
A meth kit would be pretty cool but so would a 0.7 front comp cover or other bits and pieces when looking at $$$ vs gains. The water spray isn't exactly the right answer but its def. not the wrong answer either.