PRODUCT DETAILS
Injen Axle-Back Exhaust - 2006-2011 Honda Civic Si Coupe & Sedan
The factory Si exhaust muffles one of the better-sounding four-cylinders Honda made.
This Injen system lets it out, delivering a considerably more aggressive note than the factory exhaust, especially as the engine climbs toward its VTEC crossover and redline.
It's the sound the car should have come with, without being obnoxious about it, the kind of note that makes you want to run it up through the gears rather than one that drones on the highway.
Better Flow, Real Gains
Beyond the sound, this is engineered for flow rather than just volume.
The mandrel-bent tubing is the key. Mandrel bending keeps the pipe's full diameter through every bend rather than crimping it the way cheap press-bent exhausts do, so exhaust gas moves through without hitting restrictions at the corners. Freeing up that flow reduces backpressure, which is where the power gain over stock comes from.
304 Stainless Lasts
The whole system is high-strength 304 stainless steel, which is what separates an exhaust you fit once from one you replace.
304 resists corrosion far better than mild steel or lesser stainless grades, so this isn't a system that rots out after a few winters of road salt. On a car that's now fifteen-plus years old and worth keeping, an exhaust fitted today will likely outlast the rest of the car, and it holds its finish rather than going dull and rusty underneath.
True Bolt-On
No cutting, no welding, no fabrication. It bolts to the factory mounting points and mates to the existing exhaust connection, which means an afternoon in the driveway rather than a trip to a muffler shop.
It's also reversible, so the factory system goes back on if you ever want it, which matters for resale or if you need the car quiet for any reason.
Fitment
2006-2011 Honda Civic Si Coupe and Sedan (FG2 / FA5)
Axle-back system. 304 stainless steel, mandrel bent.
Who Should Grab This
This is for the 8th gen Si owner who wants the car to sound like the K20 it has and flow better while it's at it. Mandrel-bent 304 stainless, a genuine bolt-on with no cutting or welding, and a note that suits the car without droning. Whether it's your first exhaust or part of a fuller build, it's the kind of system you fit and keep. Bolt it on and hear the engine properly.
Fits: 2006-2011 Honda Civic Si Coupe and Sedan (FG2 / FA5).
Material: High-strength 304 stainless steel, mandrel bent.
Install: Bolt-on, no cutting or welding required.
Outlet Size: 4.0 inch Tip
2006-2011 Honda Civic Si Coupe
2006-2011 Honda Civic Si Sedan