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Twisted Steel Tri-Y Long Tube Header 304 Stainless Steel

Honda Civic Si 06-11 L4-2.0L
Part Number: 48-36603-HN

MSRP: $1,015.88


  • Dyno-Proven Gains up to +12 HP & +10 Lbs. x Ft. TQ
  • 1-5/8 IN Primary Tubing to 1-7/8 IN Secondary Tubes Into a 2-1/2 IN Collector
  • Tri-Y Designed 4-2-1 Headers
  • Provides added performance and aggressive sound
  • 100% Hand TIG-Welded by Certified Craftsmen for Strength and Durability
  • Incorporates Heavy Duty 4 IN Flex Tubes for Added Strength and Durability
  • Includes a Lower Flange Gasket, Nuts and Bolts for a Hassle-Free Installation
  • 3/8 IN Thick OE-Style Laser-Cut Flanges for a Leak-Free Seal
Read More

aFe POWER Twisted Steel Tri-Y Headers for the 2006-2011 Honda Civic Si (Coupe/Sedan) with L4-2.0L VTEC engine. This high performance headers deliver the perfect balance of pure, race-inspired performance and sound. This kit comes as a Race version for added performance. In recent testing the header produced +12 HP and +10 lbs. x ft. of TQ on our in-house dyno. This performance triple-y header is constructed of 1-5/8 IN primary tubing which merge to 1-7/8 IN secondary tubes, with a 2-1/2 IN exit. The tri-y design pairs opposite firing cylinders with equal, specifically tuned primary lengths, maximizing scavenging and torque throughout the power band. Integrated 4 IN flex tubes are used for added strength and durability. This system constructed of high quality, brushed finish, 100% TIG welded 304 stainless-steel tubing that is mandrel bent to reduce restriction and improve efficiency. The headers are a direct bolt-on system which requires no cutting or drilling.

Tri-Y Design:
Paired opposite firing cylinders with equal, specifically tuned primary lengths maximizes scavenging and increases torque throughout the power band.

4 IN Interlock Flex Pipes:
This unique header uses a heavy duty 4 IN flex tubes with an internal interlock liner for added strength and durability.

TIG Welded:
100% TIG welded by certified craftsmen for race proven strength and durability. TIG welding provides the strongest welds reducing stress cracks.

Brushed 304 SS Construction:
This header is constructed of durable mandrel bent brushed 304 stainless steel tubing for maximum performance, corrosion resistance and strength eliminating cracking.

Race Disclaimer:
This is a Race Only product that is to be used solely for competition, it cannot be used on vehicles that are operated on public streets, roads or highways. Its use is limited to closed-course and open-course racing that is formally sanctioned by a recognized racing organization. Any other use, including recreational off-road use, could be in violation of local, state and federal laws. To complete the purchase of this item, aFe POWER competition acknowledgement/liability release form must be filled out and submitted.

aFe headers are engineered and manufactured in our Corona, California manufacturing facility.


Vehicle Applications

Year Make Model SubModel Engine Fuel
2006-2011Honda Civic Si L4 2.0L Gas
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MSRP: $1,015.88

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