Doin some searching and came across this:
http://cgi.ebay.com/ebaymotors/Perrin-08-WRX-Top-Mount-Intercooler-TMIC-PSP-ENG-320_W0QQcmdZViewItemQQhashZitem19b7c3847eQQitemZ110457226366QQptZMotorsQ5fCarQ5fTruckQ5fPartsQ5fAccessories
$US800 for a Perrin TMIC seems like a good deal.
The question would be, for a GB, how many could be had for what price.
Alternatively, if there's a cheap provider in the US, what they'd do a GB on these for, seems cheaper than the AVO alternative of late, they've got inflationitis of late.
Any interest????