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Skunk B-Stock Headers are a new in box product with all the pieces required for installation, BUT they have minor fitment issues that are resolved through the use of stiffened rear motor mount and minor modification of the undercarriage of the car. For contact-less fitment, the installer must clear a small area on the undercarriage of the 06-11 Civic Si so that the header can comfortably fit without contacting the firewall or undercarriage. See attached video below. All Skunk2 B-Stock products are sold "as is" and Do Not have any available manufacturer warranty.
** An upgraded rear motor mount is required for header installation **
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 Series 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 Series 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 Series Header provides the perfect combination of top-end power without sacrificing mid-range performance or throttle response.
We strongly suggest a rear aftermarket engine mount is required with this part and do not recommend installing without one. Please call or message us for details