There's an air box mod that goes with the Ivan's mod for the FZS1000, that involves cutting a part away to increase air flow, coupled with a freer flowing air filter. I've no idea if Ivan's do anything for the 600.
Ram air is not simple to do apparently. Years ago, Kawasaki put many, many hours into developing theirs, and it's about air box capacity, shape, pressures and all kinds of other considerations, so I once read. Not forgetting carb and jetting changes.
When I had my FZR1000EXUP back in the early 90s, I enquired at a tuning firm about modifying to ram air, as I noted all the pipes from the fairing did was direct air onto the cam box. They said they'd had an RC30 in for months, trying to get it to work, dozens of hours spent, and still not sorted properly. Maybe things have moved on since then and more is known by more people about what the essentials are, but I don't think it would be a simple backstreet bodge.