well, we're getting a little off subject, but i'll roll with it
first of all, i'm merely advocating an intercooling system over water injection, wether it be air to air or air to water. i just think it's a way better solution than water injection, much more reliable. especially if you're using the water to air coolers that use seperate cooling loops than the engine coolant. i've always thought it would work a lot better to use water that wasn't already 200 degrees to cool your air.
i understand how the air to water heat exchangers work on roots-ish blowers work, and where they're located. admittedly i know nothing about supercoupes, never really interested me, so i can't say anything about them. but, i've spent quite a bit of time around the harley trucks and such, and nobody ever mentioned the heat exchanger on them, nor did the product information about the harley trucks or the new cobras mention it either. it seems kindof odd, that would have been an excellent sales tool. but, i won't question you there, i imagine you know what you're talking about. i wish they would have told us that, or provided it somewhere. i never heard the mechanics talk about it either... but it really would have come in handy once in a while.
but anyways, my point is, intercooling by any method is generally going to be a better solution than water injection, of which i think you agree with.