Flashark Exhaust Headers for 2006-2011 Honda Civic Si 8th Gen FG2/FA5
Upgrading or replacing the exhaust header is a key step in enhancing engine performance and sound for your 2006-2011 Honda Civic Si 8th Gen. Whether you're on the track or cruising the streets, 8th Gen Civic Si headers deliver a noticeable boost in horsepower, torque, and an aggressive exhaust tone. Flashark offers high-quality, direct bolt-on headers for 8th Gen Civic Si FG2/FA5, making installation easy with no modifications required—just install and enjoy the enhanced performance. Perfect for enthusiasts looking to maximize their Civic Si's potential.
High-quality aftermarket parts. Professional workmanship. Strict quality control during the process. The item exactly the same as the picture shown. All necessary hardware, bolts, and gaskets
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What do Exhaust Header do?
Exhaust headers are designed to boost horsepower, torque, and improve your vehicle's sound, especially for your 2006-2011 Honda Civic Si 8th Gen. Replacing or upgrading your headers and exhaust system is an effective way to increase engine performance. Want your 8th Gen Civic Si to sound more aggressive, like an American muscle car? This header can add up to 8-20 horsepower and significantly enhance exhaust tone.
Installing a high-performance exhaust system also improves fuel efficiency by about 0.5 mpg. While that may seem small, consider this: If gas costs $3 per gallon and you drive 15,000 miles a year, you could save around $85 annually on fuel. In five years, that’s enough to nearly pay for a complete cat-back exhaust system!
Exhaust Header VS Manifold, which is the better choice?
The structural differences between exhaust headers and manifolds lie in material and design. Exhaust headers are made from lighter, thinner steel, whereas exhaust manifolds are constructed from thick iron. Headers are also longer, allowing each cylinder to have its own tube, which eliminates the back pressure created by manifolds. This results in improved performance, as the gases exit the engine more efficiently. For your 2006-2011 Honda Civic Si 8th Gen, upgrading to headers offers better performance by reducing back pressure and boosting horsepower and torque. Therefore, exhaust headers are the superior choice over traditional manifolds for maximizing your engine's potential.
It sounds okay. Fitment was kinda trash but I made it work. Over all it opened up the air way and low key felt my cars power. Would recommend if you looking for cheap mods for your car 👍
T
Thomas
Civic si headers
Over all nice product quality was good and bolted right up to my after market cat back system the only thing I had to do was get a file and rework the hole for the bolt to attach to the back of the head they were a tad bit off. That only took a few mins to correct and a trip to the tool store as I didn’t have one but I would definitely recommend. I’m happy with the finished install
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Put this catch can on my ’21 Q60. Install was straightforward, hoses lined up perfectly. Engine feels smoother on acceleration, and I’m confident it’s preventing future carbon buildup.
Put these on my ’10 G37 Coupe last month. Fitment was spot-on, install went smooth, and no rattles or leaks after a few hundred miles. Noticeable bump in power and a deeper exhaust tone without too much drone.
Installed these on my ’08 G37X over the weekend, and I’m impressed. The fitment was spot-on, no weird gaps or alignment issues. Throttle response feels snappier, and there’s a nice bump in low-end torque. The sound is a bit more aggressive but still daily-driver friendly.
I installed these on my 2012 G37 Coupe. Fitment was decent—took some effort around the steering shaft but nothing crazy. Once installed, the car feels more responsive and definitely pulls harder above 4K RPM. The sound is throatier too, especially at wide open throttle. Paired with a tune, it made a noticeable difference. So far, no leaks or issues.
