The FC1 Si is the most slept-on turbo Honda platform right now — here's how to build one without wasting money on parts that don't talk to each other. 1. Start with the tune, not the bolt-ons. The L15B7 responds to a proper Hondata FlashPro calibration like nothing else in this price range. You're unlocking power the factory left on the table, and everything you bolt on after this actually has a brain behind it. Skipping this step is like buying wheels before you fix your suspension geometry — looks cool, drives stupid. 2. Intercooler before you add boost targets. The stock unit heat soaks on a spirited back road, let alone a track day. A good front mount intercooler keeps intake temps consistent so your tune isn't pulling timing every third pull. This is the mod you won't feel immediately but will absolutely feel the absence of when it's 95° out. 3. Get the wheel and tire fitment dialed. This is where the FC1 goes from "nice Civic" to something people actually walk up to in parking...