Skunk2 Alpha Series Header for 12-15 Civic Si/13-15 ILX
CA$665.95
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).