Re: Air to water, or Air to Air?
I always vote Air to Water if you are running hot air. Yeah air to air is easy and can be dirt cheap, but air to water isnt as "$$" as most thing. You can place the core anywhere you want vs in the front of the vehicle or an area of cool air flow- much less charge pipe to worry about. Its a million times easier to run 1" water lines threw an engine bay than it is to run bent metal 2-3" pipe. You can cool a charge much better with air to water due to the ease of iceing a reservoir.
All in all it just depends on budget, and what type of parts you are looking for. Yeah a bling water to air is going to be $$ but you could make one for cheaper than your off the shelf greedy/hks/etc. front mount kit.
Consider this one vote water to air, not to say I dont think air to air is efficent or smart, both have alot to say for themselves..