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Civic Si Cold air intake
Your Civic Si
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+3–8 whp (est.)
Easy$400–$4501 hr
Why do it
More turbo sound and a few horsepower, especially when tuned.
Tools you'll need
- 10mm socket
- Screwdrivers
Parts to buy
- PRL Motorsports Cobra cold air intake (Street) 50-state legal (CARB EO D-878-2). The standard-bore version needs no tune.Fits 2017–2020
Doesn't fit your car (0)
Always double-check fitment for your exact year, trim and transmission before buying. Prices change. ModBuddy doesn't earn money from these links.
Steps
- Disconnect the negative battery terminal.
- Remove the stock airbox and intake tube.
- Install the new intake and carefully move the sensor over.
- Tighten all clamps and check for loose connections.
Safety first
- Park on flat, solid ground, set the parking brake and chock the wheels.
- Use jack stands rated for your car. Never get under a car held up only by a jack.
- Let the engine and exhaust cool completely before touching them.
- Disconnect the negative battery terminal before unplugging sensors or electrical parts.
- Wear safety glasses, and gloves around sharp heat shields and hot fluids.
- Tighten bolts to the torque spec in your factory service manual.
- If a step doesn't match your car or you're unsure, stop and ask a shop.
These are overview steps written to help you plan the job. Always follow the instructions that come with your part and the procedures and torque specs in your factory service manual. Horsepower is an estimate; results vary.