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K-Tuned 304 Series Header - 06-11 Civic Si (FA5/FG2)

WARNING: Cancer and Reproductive Harm

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Ships in 1-5 business days. 

The K-Tuned 8th Gen Civic SI Header was specifically designed to optimize the performance and power output of the K20Z3 engine that is found in all 2 and 4 door SI models. The header was developed using a proven 4-2-1 Tri-Y design that delivers power gains almost everywhere in the power band, not just the higher rpm range. Additional performance is accomplished by using large diameter piping to speed up the flow of exiting exhaust gases. K-Tuned also use stepped piping and smooth transitions that minimize restriction. Fitment past the subframe and sway bar is perfect with extra clearance available for engine movement.
Starting with 44mm primaries that smoothly step into 50mm secondaries, and the header finishes off with a 64mm or 2.5” exit. Like all K-Tuned stainless headers, it is assembled using mandrel bent, 304 stainless steel tubing and is fully tig welded. K-Tuned also uses a slightly thicker gauge tubing that allows for better weld penetration and additional strength. The CNC cut 3/8" thick flanges are also double welded and then ported for optimum flow at entry and exit. This header directly replaces the OEM 2 piece design and eliminates the catalytic converter so we included a short 2.5" test-pipe with defouler for the secondary O2 sensor.
Applications: Direct bolt-on for all 06-11 Civic SI models. Fits both 2-door coupe and 4-door chassis. 
Key Features:
  • Fits Civic Si with K20Z3 engine. 
  • 4-2-1 Tri-Y Design 
  • 304 Stainless Steel 
  • CNC cut 3/8" thick SS Flanges 
  • 2.5" Outlet