DC Sports Cat-Back Exhaust System, 2012-2015 Honda Civic Si Sedan (FB6), SKU: SCS7048

If you drive an FB6 and the stock exhaust feels like it’s got a sock in it, this DC Sports Honda Civic exhaust fixes the vibe fast. This is a catback exhaust Honda Civic Si owners pick when they want the K24Z7 to sound like a K24, not a commuter car, and they want it without hacking anything up.

This is a true bolt-on exhaust Civic Si setup that keeps your factory catalytic converter. You swap the factory piping and muffler for a free flowing 2.5 inch exhaust Honda Civic Si guys can actually daily. Expect a modest gain on a stock car, mostly in throttle response and how clean it pulls up top. If you already run intake and tune, this Honda Civic Si catback system usually feels less choked near redline and picks up a bit more.

We build this Civic Si sedan exhaust system with 2.5 inch (63.5mm) mandrel bent T-304 stainless steel piping front to back. No crush bends and no mystery metal, just stainless steel exhaust Civic Si owners can keep on the car for years. The straight through muffler and smooth routing help keep backpressure down and flow consistent. The whole Civic Si T-304 stainless exhaust comes hand TIG welded, so fitment stays tight on the factory hangers and it holds up to heat and winter grime better than mild steel.

Out back you get a 4 inch tip that actually looks right on an Si sedan. If you want a Civic Si 4 inch tip exhaust look without going full loud and sloppy, this checks the box.

Sound wise, it goes deeper and more aggressive than stock, but it avoids the straight pipe regret most of us have heard at least once. You can still talk on the highway, but when you lean into it, the car finally sounds awake. One customer put it perfectly: “Cold starts are mean, VTEC sounds angry, but I can still drive my grandma to brunch.”

Is it louder than stock? Yep. If you’re allergic to any drone at all, you might notice it on long freeway drives. If you want a Civic Si 2015 exhaust upgrade that stays livable Monday through Friday and feels fun on a back road, this DC Sports exhaust Si sedan setup lands in the sweet spot. We run these exact parts because they make the car more enjoyable without turning every drive into a noise test.

Key Features

• Direct fit Civic Si FB6 catback exhaust for 2012-2015 Civic Si Sedan
• 2.5 inch mandrel bent piping for a proper 2.5 inch exhaust Honda Civic Si upgrade
• T-304 stainless construction for a real Civic Si T-304 stainless exhaust, not plated steel
• Straight through muffler layout for better flow and a sharper tone
• Hand TIG welded for clean fitment on factory mounting points
• 4 inch polished tip for the Civic Si 4 inch tip exhaust look
• Solid pick if you need a Civic Si 2013 catback exhaust, a performance exhaust 2014 Civic Si setup, or a DC Sports exhaust 2012 Civic Si replacement
• SKU: SCS7048, DC Sports Honda Civic exhaust, DC Sports exhaust Si sedan

If you’ve been hunting a Civic Si sedan exhaust system that bolts up clean, sounds right, and flows better without being a constant headache, this catback exhaust Honda Civic Si system does the job.