I am not a big fan of running direct injection engines without at least one catch can, so I bought a kit from Mishimoto for a 21 2 liter and adapted it to my 21 sport 2.5 liter. I had to modify the bracket that came in the kit. The holes that they recommend to use are there, but on the Sport there are A/C lines in the way. I drilled a hole about in the middle of the bracket. This allowed me to mount the bracket behind a plastic cover lower on the firewall. I checked to make sure there wasn’t anything behind the cover where the bolt I used was. The cover holds the bracket on one leg of it to level it and keep it that way. The line that goes to the Crank case vent and intake manifold is 1/2” ID. The catch can is 3/8. A reducer was made to combat this problem. Some say these are not needed. I say better safe than sorry. They (I had two)worked on my 17 WRX, so I’m a believer in the need for this. Pics….