[Richard L]

It sounds confusing at first but they all have one objective - cooling.

I can only speak for water injection and hope someone else will speak about others on this thread - it will certainly be interesting discussion to continue.

I may be wrong, on this, I know only two items that will cool the combustion chamber and the rest belongs to cooling the charge air before entering the combustion chamber.

Water injection's sole job is for in-cylinder cooling - inlet cooling is only a side effect, also applied to alcohol injection. I have to mention that dumping fuel is another method of cooling an egine internally - widely practised.

As regarding your engine, install an intercooler or chargecooler is effective and maintainance free, but all other cooling methods require regular servicing.

I am not answering you question directly, but just to help you to categorize their functions into groups before getting too deep in details.