Specifications:
Brand Name: FLASHARK
Certificate: ISO9001:2000
Application: Automobile Exhaust Header
Material: Stainless Steel
Surface: Mirror Polish
4-1 piping; 1-piece header design
Features:
- 100% T-304 Stainless Steel with a Polished Finish
- Direct bolt-on, increased exhaust flow for improved engine performance
- Si model only
What does Exhaust Header do?
Boost Horsepower and torque, and Save on Gas with Headers and Exhaust System Modifications!"
Replacing a vehicle’s headers and exhaust is a way to add horsepower and torque, and it will also increase your vehicle’s volume. Want a car that sounds like an American muscle car should? This header will help your vehicle achieve that and it can add up to 8-20 horsepower.
Install an exhaust system means about a 0.5 mpg gas mileage improvement. While that might not sound like much, consider this: If gas costs $3 a gallon and drive this truck 15,000 miles a year, you’re saving yourself about $85 a year on gas. In five years, you’ll have saved nearly enough money to 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 are the material and size. From the material, exhaust headers are made of lighter, thinner steel, while exhaust manifolds are made of thick iron. Exhaust headers are also longer than exhaust manifolds. When in use, exhaust manifolds create back pressure, which lowers performance. Because each cylinder of the engine is given its own tube, however, headers eliminate this problem; thus, allowing the gases to exit without the creation of back pressure. Therefore, exhaust headers are a BETTER choice than an exhaust manifold.
Fitment & Compatibility
| Brand | Model & Trim | Year Range | Full Compatible Specs |
|---|---|---|---|
| Honda | Civic Si | 2006 | Coupe 2-Door Body Style; Factory-Equipped 2.0L (1998CC / 122Cu. In.) K20Z3 DOHC Naturally Aspirated Inline-4 (I4) GAS Engine |
| Honda | Civic Si | 2007-2009 | Coupe 2-Door Body Style; Factory-Equipped 2.0L (1998CC / 122Cu. In.) K20Z3 DOHC Naturally Aspirated Inline-4 (I4) GAS Engine |
| Honda | Civic Si | 2007-2009 | Sedan 4-Door Body Style; Factory-Equipped 2.0L (1998CC / 122Cu. In.) K20Z3 DOHC Naturally Aspirated Inline-4 (I4) GAS Engine |
Q1: Will this FLASHARK short exhaust header fit both the 2-door coupe and 4-door sedan 2006-2009 Honda Civic Si?
A1: Yes! The FLASHARK shorty exhaust header is precision-engineered as a direct bolt-on for both the FG2 Coupe (2-Door) and FA5 Sedan (4-Door) body styles of the 2006, 2007, 2008, and 2009 Honda Civic Si factory-equipped with the 2.0L K20Z3 DOHC naturally aspirated engine.
Q2: Is this header compatible with base model Civics like the DX, LX, or EX?
A2: No, this high-performance exhaust header is engineered strictly for the Honda Civic Si model only. It will not fit non-Si trims (such as DX, LX, EX, or EX-L) featuring the R18 engine, as the exhaust flange configuration and cylinder head layout are entirely different from the K20Z3 block.
Q3: What type of piping architecture does this 8th gen Civic Si header utilize?
A3: This FLASHARK performance header features an optimized 4-1 piping architecture integrated into a solid 1-piece shorty header design. This setup maximizes exhaust scavenging by routing gases smoothly from the four individual cylinders into a single collector, effectively reducing backpressure.
Q4: How much horsepower and torque can I gain from the FLASHARK K20Z3 exhaust header upgrade?
A4: Upgrading to the FLASHARK K20Z3 performance header can unlock an impressive increase of 8 to 20 horsepower alongside a substantial boost in mid-to-high range torque. It drastically improves throttle response and engine breathing, making the high-RPM VTEC crossover feel and sound far more aggressive.
Q5: Does this shorty header require welding or custom fabrication for a 2007 or 2008 Honda Civic Si?
A5: No welding, cutting, or custom exhaust fabrication is required. This 2006-2009 Honda Civic Si header features a true direct bolt-on design that aligns perfectly with your factory block studs and stock downpipe components, making it an ideal choice for a straightforward DIY garage installation.
Q6: What material is used to construct the FLASHARK 2006-2009 Honda Civic Si exhaust header?
A6: Our premium shorty header is manufactured from 100% high-quality T-304 stainless steel with a pristine mirror-polished finish. This heavy-gauge structural material provides superior rust prevention, high-temperature tolerance, and excellent corrosion resistance under intense racing conditions.
Q7: Will installing this Civic Si shorty header improve my vehicle's gas mileage?
A7: Yes! By increasing your engine's overall volumetric efficiency and smoothing out restrictive airflow, it reduces pumping losses. On average, drivers can experience an improvement of up to 0.5 MPG, which translates to notable gas savings over regular driving intervals.
Q8: How does this exhaust header change the exhaust note of the 2.0L K20Z3 engine?
A8: By replacing the heavy, restrictive factory assembly with smooth mandrel-bent T-304 stainless steel pipes, this header unleashes a much deeper, crisper, and more pronounced sporty tone. It gives your 8th generation Civic Si a refined and authoritative sound under wide-open throttle without annoying cabin drone.
Q9: Does the FLASHARK package include all the necessary installation gaskets?
A9: Yes, the FLASHARK performance kit comes complete with premium, high-temperature exhaust gaskets right inside the box. This provides a complete, flush, and completely leak-free seal against the engine block, saving you time and money from buying secondary hardware separately.
Q10: Why should I choose a shorty header over a full long tube race header for my FG2/FA5 chassis?
A10: A shorty header delivers a significant horsepower gain, sharp throttle response, and substantial weight savings while retaining your vehicle's factory catalytic converter positions and optimal ground clearance. This makes it an incredibly reliable, low-maintenance choice for daily drivers and track day cars alike.
Q11: Will installing this FLASHARK aftermarket header trigger a Check Engine Light (CEL)?
A11: Because this is a shorty design that respects the downstream factory emissions layout and factory sensor placements, it typically does not trigger a catalyst efficiency Check Engine Light (CEL) on a healthy engine, allowing you to enjoy clean performance gains seamlessly.
Q12: Why is FLASHARK the best value choice for an 8th Gen Civic Si exhaust header upgrade?
A12: FLASHARK combines professional-grade engineering—including 100% polished T-304 stainless steel construction, exact FG2/FA5 fitment, and a high-flow 4-1 design under strict ISO9001:2000 quality standards—at a highly competitive direct-to-consumer price point, offering top-tier performance without the brand-name premium.