2025 Civic Si Engine Problems. For 2025, honda added some enhanced fake engine noise that makes the si sound a hell of a lot like the civic type r. I’m usually not a fan of this type of stuff, but it.
I’m 50k miles in on my 2023 si, not a single issue with my gear box, no tune, only a cat back exhaust, and k&n intake. These small changes make a decent difference on the road, where the 2025 honda civic si handles with confidence to deliver a planted drive.