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Even if it is 100degrees outside, an intercooler will still work fairly well. The discharge from a 68% efficient turbo (about average, maybe a little low) on a 100degree day with 7 lbs of boost is close to 200 degrees. With a Good intercooler, the effeciency will be around 65-70%, this will lower your temps to about 133 degrees. Thats a considerable drop. Use an intercooler if your going to run 6-7 or more pounds of boost, if you use one with much lower than that you're kind of wasting your money. If you intercool 4 lbs of boost your going to be loosing a signifigant percentage of boost due to the pressure drop, it becomes not worth it anymore. Unless you buy a REALLY nice intercooler.
Air to water setups are more complicated to setup and are generally used in shorter runs, but I have seen a few in action on a daily driver. I think autospeed.com did an article on it. I think with the correct setup you're going to be fine, if you don't run lean and have a good tune then you don't have to worry about it.
Buzz1167
Jon N
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