Do not get carry away by the previous comments, lots of choices for intercooler in the market. Some will fit the hks hardpipes with a bit of a fiddle,some will not though. So check with the manufacturer if the hks pipes will fit with their intercooler before you make any assumptions.
I could suggest a few units that will fit the hks pipes. I'll just use though the one mentioned above, the AMS new unit.
Do you want proof ?
Here you go, fitted this a couple of months back on a friends car,