Hybrid Racing Cold Air Intake for 06-11 Civic Si

Hybrid Racing Cold Air Intake - 2006-2011 Honda Civic Si (FA5 / FG2, K20Z3)

We designed, tested, and revised this one on the 8th gen platform until it did what we wanted. In our own back-to-back testing, we measured a 14 horsepower peak gain and 9 horsepower average across the curve against the stock airbox. Against a typical 3.5 inch cold air intake, we picked up another 2 to 3 horsepower plus a smoother curve, and that smoothness is what you actually feel driving rather than just a bigger number. It works on a stock K20Z3 and it still makes sense once you've added cams and exhaust.

The Full Silicone Tube Is The Whole Idea

Most intakes use metal or plastic tube, and both soak up engine bay heat and pass it straight into your intake charge. Ours is quarter-inch thick fiberglass-reinforced silicone, which holds its shape under vacuum and insulates far better than either. Lower intake temps mean denser air, and denser air is power. It's the single biggest reason this intake outperforms conventional designs on the same car.

Up front there's a 6-inch velocity stack that cuts inlet restriction, which is where you notice it up top. Your K20Z3 stops fighting for air at the exact point in the rev range where it wants the most.

Built-In Anti-Hydrolock Protection

The injection molded bypass manifold does several jobs at once. It mounts your factory MAF, it connects the included silicone lines for the valve cover vent and bypass valve, and it builds in an air bypass path in case your filter gets soaked.

We tested that claim rather than just printing it. We fully submerged the filter in a bucket of water with the engine running, and it idled and revved without hydrolocking. That said, don't go looking for deep water. No intake makes driving through a flood a good idea, and we'd rather tell you that than let you find out.

The manifold also knocks down parasitic Helmholtz resonance, which is the technical way of saying it smooths out the weird dips some intakes put in your powerband.

Everything Needed To Fit It Properly

Big piping needs room, so the kit includes what it takes to make room. You get a powder coated steel battery tray that relocates the battery in front of the transmission, clearing the space the intake needs. There's a silicone upper radiator hose for clearance, plus silicone replacements for the OEM breather and bypass tube so the finished bay looks deliberate instead of half-done. All hardware is included.

You Need A Tune, No Shortcuts

Read this before you buy. This intake requires tuning software like Hondata FlashPro, and it must be tuned MAP based. Do not run it on the factory calibration. This isn't a suggestion or a nice-to-have, the car will not run correctly without it, so have your tuning sorted before the intake goes on.

Fitment

• 2006-2011 Honda Civic Si Coupe (FG2)
• 2006-2011 Honda Civic Si Sedan (FA5)

Fits all 2006, 2007, 2008, 2009, 2010, and 2011 Civic Si models with the K20Z3, coupe and sedan.

Who Should Run This Intake

This is for the 8th gen Si owner who wants measured gains rather than a louder engine bay. Stock car looking for a real first modification, or a built K20Z3 with cams and exhaust that needs the intake side to keep up. We run this hardware on our own cars, and everything you need to fit it is in the box. Get your FlashPro sorted and bolt it on.

Fits: 2006-2011 Honda Civic Si (FA5 sedan / FG2 coupe), K20Z3. SKU: HYB-CAI-01-10. Gains: 14hp peak and 9hp average over stock, 2-3hp over a typical 3.5" cold air intake, per our testing. Tube: 1/4" fiberglass-reinforced silicone. Filter: 6" velocity stack. Includes: injection molded bypass manifold with anti-hydrolock path, powder coated steel battery relocation tray, silicone upper radiator hose, silicone breather and bypass tube replacements, all hardware. Required: MAP-based tuning (Hondata FlashPro or equivalent). Do not run on the factory calibration.