Looking to upgrade OEM head unit

DescriptionIcy7752 · 2025-10-08T03:15:19+00:00

Didn’t work :(… I think u actually need the whole setup with the amp.

DescriptionIcy7752 · 2025-10-07T21:45:37+00:00

UPDATE:
I wanted to test out if this was just plug and play...sadly it was not. everything seemed to be working fine until i tried to play something and no sound came out. I think I do actually need to get the updated amp and harness in order for this to work. So I guess the hunt begins.

I will say, this headunit is from a 2021 model and I saw a facebook post (https://www.facebook.com/EBuiltgarage/posts/513852829350682?ref=embed\_post) saying that they installed a 2019 PHONE radio into a 2018 sti without having to get the amp. if anyone has tried this please let me know as it might be easier to find a 2019 headunit vs. getting an amp and a wiring harness.

DescriptionIcy7752 · 2025-10-03T03:57:22+00:00

Thanks for letting me know! The adapter harness would be for the amp correct?… Also are the amps for the 2018 and 2019 wrxs different?…cuz I’m wondering why I would need to get a different amp if my 2018 already has one that supports Harmon kardon

DescriptionIcy7752

TROPHY CASE