it at least has a cutout in the flat spot of the bumper. maybe the old sti one can be moded to fit. i had it on my 02 wrx. Mounts would be a pia to figure out but i could see it working in where the muffler is providing you have a exhaust that removes the muffler from the stock location
http://www.rallysportdirect.com/STI-...-STI-2002-2007
STI JDM Rear Diffuser Subaru WRX / STI 2002-2007
$82.95