Yeah it's a direct fit, easy enough job.

I'd just make sure the TMIC you put on is from a hawk STI to make the job that little bit easier, the dimensions are very slightly different between Hawkeyes and previous generations meaning you have to fettle with the lemgth of the throttle body feed hose to get a perfect fit. I have a Hawkeye TMIC on my blobeye, it fits just fine but my standard hose is only just long enough.

 

Also you'd do well to fit the larger STI scoop and diffuser to get the full benefit of the cooler. They're also a direct swap, easy job to do.

 

Don't think scoops differ on wrx and sti hawks?...though undertray/rubber skirt could well be different for bigger sti top mount

 

STI and wrx scoops are the same on hawkeye.

but you'l need the STI scoop undertray I'm also doing the same swap.