#civic-si

Just swapped a 2.5L K20Z3 into my 2013 Civic Si. The engine now spits 200hp at the wheel. Used a custom 3D‑printed intake manifold, upgraded to a 10mm throttle body, and a 1.8L P90 turbo kit. Cam timing set to 30° advance. I also fitted a 12‑inch strut bar and Brembo 8‑piston calipers for better handling.

This was my first major swap. The dyno at the shop reads 205hp peak, 240lb‑ft torque at 5,800rpm. On the street, 200hp feels solid. I used a 1:3.8 gear ratio and 19” × 9” tires.

Looking for feedback: Does this sound plausible? Any tips on fine‑tuning the ignition map or oiling the turbo? Anyone done a similar K20Z3 swap? Also, how does the 1.8L P90 kit perform at 87 octane? Any real‑world data?

Thanks for any advice.