If the engine set up is going to be stock and the ECU is not tuned...you will actually not gain all that much from a larger intercooler.
Majority of mechanics in Japan I have talked to have convinced me to delay putting in my HKS (older style for an S14 K's) intercooler in until after I have the computer retuned.
So....depends really on what you intend to do and when.
Having the larger intercooler won't hurt....I have been told that there will be a minimal (nearly non-detectable) low end power loss due to the extra air flow.
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Marc - Yokohama, Japan
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