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Keep in mind you still need to figure out what you're gonna use for couplers before you can compare it to any of the other kits. You also need to factor in the fact that air won't reach about 30-40% of that upper part due to bumper design. With proper ducting you may get some flow up there but with the stock ducting you're just creating more pressure loss across the core without the cooling benefits. If I recall the AA kit DOES include couplers/piping & ducting which definitely factors into the price.
Just because an intercooler shares similar end tanks doesn't mean the exterior or interior fin stacks on the core are anything alike. Some cores are designed to cool better/block flow to anything behind it and others are designed to cool moderately and allow more air to flow.
Judging by the fin density and angle it looks like this was meant to allow flow, which in effect will sacrifice cooling. Also just because an intercooler is larger and the piping inlets and outlets are bigger doesn't mean its better. In the end it's just more volume for the tiny turbos to fill which results in more lag and less transient response. This has been tested on evos and sti's quite a few times. Going with 3" intercooler piping & a 4" core on smaller turbos will result in a loss of power 9 times out of 10.
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