Air Suspension category referenceSpecial order · Estimated lead time: typically 2-4 weeks
17-18 Honda Civic Si - Airtech Deluxe Air Suspension
Choose year, make and model to confirm this application-specific product fits — you can add it to your cart either way.
Verify fitment- Everything in the Basic system: four air struts, Viair 444C compressor, air tank, paddle valves and gauge
- Two electronic switches for precise control over the paddle valves
- Wireless remote control
- Quick-disconnect plug, all hoses, wiring and installation manuals
- Damping adjustment knob
One approved application: 2017–2018 Honda Civic Si · Adaptive Damper will not function
- Ships from Mesa, AZ
- 12-month limited warranty
- Special order: typically 2-4 weeks
Specifications — CHD421-ADX
Product details
Read the fine print first: the approved application is the 2017 to 2018 Honda Civic Si, and the page states that the Adaptive Damper will not function with this system. Since each Airtech strut brings its own 36-way damping, that is a trade you make knowingly rather than a surprise on install day.
What the Deluxe tier adds over Basic is convenience. Two electronic switches replace manual control of the paddle valves, and a wireless remote lets you change height from outside the car. The kit is complete: four application-specific air struts, a Viair 444C compressor, an air tank, paddle valves and a gauge, plus a quick-disconnect plug, hoses, wiring, manuals and a damping adjustment knob. KSport describes the install as running the air lines to the box, connecting four wires to the plug, and wiring the compressor and relay.
The page also names the 2018 Honda Accord, including the Touring model with the same Adaptive Damper note, and the 2019 Accord as listed applications. Verify your car with the year, make and model checker, ask about camber-adjustable top mounts if your suspension is MacPherson, and use a professional installer.
Supported features
Run the air lines to the box, connect four wires to the quick-disconnect plug, wire the compressor and relay, and you are done. The included remote adjusts ride height from outside the vehicle.
36 levels of damping adjustment on every strut using the included damping knob.
Sleeve-type and double-bellow bags engineered to match the vehicle and its OEM suspension design.
Fine-tune ride height at any pressure through the adjustable lower mount.
The single 444C can raise the car from lowest to maximum height in as little as four seconds.
Available on certain MacPherson-strut applications.
Compatible applications (3)
Choices for this system
Basic (paddle valves and gauge), Deluxe (electronic switches and remote), Pro Plus (OLED remote, four-corner control) and Executive (adds height sensors and auto-leveling) are separate part numbers for this vehicle; compare them on the Air Suspension page.
Available on certain MacPherson-strut applications; ask a technician whether they apply to this vehicle.
Installation
Bolt-on struts with supplied hoses, wiring and manuals; professional installation is recommended. Recheck the system after the first 500 miles or one month; to check for leaks, inflate to 70 psi and spray each fitting with soapy water.
Air suspension setup and careWarranty & service
12-month limited warranty to the original purchaser against defects in materials and workmanship. Racing use, exterior finish and improperly installed or modified parts are not covered; keep your original invoice for any claim.
Warranty terms and service requestsOther published pages for MPN CHD421-ADX
These page names share this MPN; they do not confirm fitment. Verify your vehicle before ordering.