Skunk2 Alpha Series Header for 12-15 Civic Si/13-15 ILX
Skunk2 Alpha Series Header for 12-15 Civic Si/13-15 ILX
Skunk2 Alpha Series Header for 12-15 Civic Si/13-15 ILX
Skunk2 Alpha Series Header for 12-15 Civic Si/13-15 ILX
Skunk2 Alpha Series Header for 12-15 Civic Si/13-15 ILX
Skunk2 Alpha Series Header for 12-15 Civic Si/13-15 ILX
Skunk2 Alpha Series Header for 12-15 Civic Si/13-15 ILX
Skunk2 Alpha Series Header for 12-15 Civic Si/13-15 ILX

Skunk2 Alpha Series Header for 12-15 Civic Si/13-15 ILX

  • 3" Outlet Design

  • Drastically Improves Mid-Range Power

  • Cast T-304 Stainless Steel Construction

  • Fits 9th Gen Civic Si and Acura ILX

$482.95 $482.95 $482.95 /
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PRODUCT DETAILS

Skunk2 Alpha Series Header for 12-15 Civic Si/13-15 ILX

Transform the way your K-series breathes with the Skunk2 Alpha Series Header for 12-15 Civic Si/13-15 ILX. Born from the same R-type engineering that powers record-setting Skunk2 race cars, this one-piece stainless masterpiece unlocks noticeable horsepower, sharper throttle response, and that unmistakable VTEC growl—without sacrificing OEM fit or daily-driver reliability.


Why it hits harder than stock

  • Race-bred 4" cast bellmouth merges exhaust pulses into a turbulence-free 3" outlet, freeing up exhaust flow the factory manifold strangles.
  • CNC-mandrel-bent T-304 stainless primaries shrug off heat, corrosion, and road salt for years of spirited pulls.
  • Beefy ½" laser-cut flanges stay flat and sealed under repeated heat cycles—no more pesky gasket leaks.
  • Integrated flex section absorbs engine movement, protecting welds and downstream piping.
  • Dual O2 bungs in factory locations (plus an included defouler) keep the ECU happy and MIL lights off.*
  • Direct bolt-on to the OEM cat-back; no cutting, no hacking, just pure performance.

Track-minded construction

  • One-piece, cat-delete design eliminates an exhaust restriction worth double-digit wheel horsepower on naturally aspirated K24Z engines.
  • CAD-modeled runner lengths and merge collector geometry equalize exhaust pulse timing for a broader, smoother powerband—ideal for both autocross launches and highway pulls.
  • Engineered and dyno-validated in California by Skunk2 Racing, a brand trusted by championship-winning Honda teams worldwide.

Fitment

  • 2012-2015 Honda Civic Si (FG/FB)
  • 2013-2015 Acura ILX 2.4L (DE)
  • (Also bolts up to later 2016-2017 ILX 2.4L chassis using the same K24 powertrain.)

Installation Snapshot:

Intermediate skill • 1–2 hrs • New gasket, O2 defouler & mounting hardware included • No cutting/tune required (ECU retune recommended for max gains).

2013-2015 Acura ILX
2012-2015 Honda Civic Si
Cast Stainless Steel Construction
4" Bell Mouth Top Opening
3" Exhaust Opening
1/2" Thick Flange
(1) Downpipe
(3) Bolts
(3) Nuts
(1) O2 Defouler

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