| From your comment about Bell I assume you don't like them? But they do specialize in intercoolers unlike Ash or Godspeed. I may get flamed for this, but what the hell. This is a quote from the Bell website:
Frontal area: This is a rapidly decreasing function. If the proper core size is used, then doubling it will definitely not double the efficiency. More likely, doubling the core would raise the efficiency about 5% and cost twice the necessary amount and add substantially to the weight. Plate area: Plate Area (the sum of the Core-Plate Area which is exposed to the Atmosphere) is directly proportional to the frontal area and the thickness. Thickness, however, is a double-edged sword. With the greater thickness, the plate area increases but less ambient air can penetrate the thicker core to offer cooling.
IMHO intercoolers like Stillen, HKS, and ARC have the correct core design being taller and not as thick. They just have less flow and worse pressure drop than the larger ones. This can be fixed by porting the inlets or modifying them for 2.5" inch.
Here is a set of HKS that I modified with 2.5" piping. Notice the end tanks actually have molding to direct the air flow for even distribution.
"Being forgotten is worse than death"
"The penguines are slowly, but surely stealing my sanity"...."sprinkles" "The ricer isle is equivalent to the feminine hygiene product isle in the grocery store...real men just don't belong there." BradZ (FL) 
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Size isn't everything. - 
