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Originally Posted by sp00ln
I would agree with this. I believe the proper intercooler [size] to get is the one you're making just enough power for. I have my huge greddy FMIC and I wish I'd had gone with something smaller. Too late now I guess...
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Actually it's a moot point on a front mount, because it doesn't heat soak. Bigger still isn't necessarily better though, because anything bigger than you need to get your charge temps back within 10-15 F of ambient is just adding system volume and lag. But, the overall losses from an oversized front mount are less than an oversized (and heat soaked) top mount.
The real problem with the APS intercooler seems to be core thickness, and the bar-and-plate construction actually. Making an IC with more area is a good thing, but the core thickness made it flow less well, and the added mass (partly thickness, partly due to core type) defeated the purpose of the larger core. The best IC for Subarus with moderate turbos (medium-sized GT30 or smaller IMO) is the JDM v7+ TMIC, but the USDM is only a bit smaller. Hence the lack of upgraded topmounts in SECCS on STis, for the most part.