Anyhow, I did this test cause I keep hearing people say it won't fit. So here we go...............
Stock GR sti tmic vs GD sti tmic comparison. The bigger unit is the GR core with no throttle body hose.
Now on to the test fit.
First you will need this 3rd bracket from a GR sti and bolt it on in place like it's shown in the bottom picture, if not you can always fabricate a bracket to extend it out to accommodate for the larger core.
A quick install tease to see if it fits.
AC lines clear. Check
Wastegate actuator and etc. clearance. Check