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Skunk2 06-11 Civic Si Alpha Race Header

Skunk2 06-11 Civic Si Alpha Race Header-A1
Skunk2 06-11 Civic Si Alpha Race Header-A2
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Skunk2 06-11 Civic Si Alpha Race Header-A6
Skunk2 06-11 Civic Si Alpha Race Header-A7
Skunk2 06-11 Civic Si Alpha Race Header-A8
Images may be for reference only

Skunk2 06-11 Civic Si Alpha Race Header

★★★★★ ★★★★★ 7 Reviews
Price: $471.99 (5% off)
$449.99 & Free Shipping

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Skunk2 is proud to announce its all-new Alpha Header for the '06-'11 Civic Si. Patterned after our already popular and dyno-proven MegaPower Headers, which have been used by leading, competitive race teams for years, Skunk2's Alpha Header employs many of the same design characteristics and technology. Our decision to produce the Alpha Header was driven by our desire to make our race-proven design more affordable and accessible to everyday enthusiasts. New manufacturing techniques allow us to do so at a lower overall cost, making race-winning header technology available to everyone. Skunk2's Alpha Header for the eighth-generation Civic Si offers Skunk2 performance, industry-leading customer service, and a full warranty policy, all at a price comparable to lesser budget-minded headers. Unlike the budget-minded headers, though, only Skunk2 Alpha Headers ensure precise fitment and the peace of mind of knowing that a Skunk2 representative is just a phone call or email away.

All Skunk2 headers are designed and engineered to maximize exhaust flow and increase both horsepower and torque throughout the powerband. The unique design is the result of more than a decade of racing experience coupled with computerized modeling and extensive dyno testing. Each Skunk2 Alpha Header features equal-length, sequentially paired, stepped primaries and a 4-2-1 tri-Y design that terminates into a collector with a 2.5-inch outlet. These features, paired with Skunk2's unique design specs, provide an extremely broad powerband that's applicable to a wide range of engine sizes and configurations. Alpha Headers also feature the smallest possible primary tubes required to achieve optimum overall and peak power. By minimizing the primary tubes' diameter, Skunk2 is able to maintain the highest possible exhaust gas speed throughout the header, which improves mid-range power and throttle response significantly. Skunk2's Alpha Header provides the perfect combination of top-end power without sacrificing mid-range performance or throttle response.
  • Equal-Length, Tri-Y Design
  • T-304 Stainless Steel Construction
  • Unique Cylinder Pairing
  • Specially Designed Steps
  • Thin-Wall, Cast Collector
  • Complement with a genuine Skunk2 MegaPower R Exhaust system for maximum exhaust flow and gain.
  • Race applications only - eliminates catalytic converter.
  • Includes adapter flange, donut gasket, and exhaust hanger mounting bracket.
  • O2 sensor bung thread pitch: M18 x 1.5.
  • *Not compatible with K24 bottom-end swap*

Not legal for sale or use in California on any pollution controlled motor vehicles. See for state by state emissions requirements.

WARNING: This product may contain chemicals known to the State of California to cause cancer or birth defects.


Brand: Skunk2
Part Number: 412-05-1930
UPC: 873265003327
CARB Approved: No

Vehicle Fitment

Honda Civic
2006 Honda Civic Si Coupe 2007 Honda Civic Si Coupe 2008 Honda Civic Si Coupe 2009 Honda Civic Si Coupe 2010 Honda Civic Si Coupe 2011 Honda Civic Si Coupe
2007 Honda Civic Si Sedan 2008 Honda Civic Si Sedan 2009 Honda Civic Si Sedan 2010 Honda Civic Si Sedan 2011 Honda Civic Si Sedan

7 Reviews ★★★★★ ★★★★★

★★★★★ ★★★★★
4.86/5.00 Stars out of 7 Reviews
Write a Review
5 Most Recent Read All 7 Reviews
Great product and service
Aaron | July 25th, 2020
The alpha header was in perfect condition. It included the exhaust adapter, O2 extension, hanger bracket and O2 sensor extension. I had to use existing exhaust bolts and purchased new manifold spring bolts. Ran a flash pro base bap with no check engine light. Even with the restrictive stock exhaust, this header produced good mid and hi end gains. Overall very, I am very pleased with this upgrade.
Best headers I’ve ever owned
Trey Sanders | May 2nd, 2020
Don’t do what I did. These header came with everything you need in the box. Definitely made a difference in power. Is Very loud. So if you want something quiet. This is not it. But definitely recommend
Best Header for the Money!
Kongmeng Vue | March 22nd, 2020
I can totally feel more torque, especially in midrange. The material and welds look great! Hardware is not included so if your manifold nuts and bolts are rusted I highly advise y’all to go buy new ones from Honda. O2 extension came with the purchase so don’t bother buying another one. Also, buy a new manifold gasket; OEM is always best. Get this header and be done with it. Pair it up with a nice 3 in. exhaust and it’ll turn your Si into a whole ‘nother beast. And yes, get a rear motor mount. It is highly recommended that you do.
Can’t Wait
BlueSluggishSi | March 14th, 2020
To Install This Header, Going To Sound A1 And Loud Lol
Amazing sound
James | November 16th, 2019
This is a great header. I didn’t think it would really change the sound of my 76mm invidia N1 too much but it did. Made it deeper and still sounds extremely nice thank you
Read All 7 Reviews