What TruHart air suspension is and who makes it
TruHart Performance is a California-based suspension manufacturer that makes bolt-on air suspension kits for street cars and light trucks. Their systems replace your factory coil springs or leaf springs with air springs — flexible rubber chambers filled with compressed air that adjust ride height electronically. TruHart sells complete kits that include the air springs, compressor, valve block, wiring harness, and management system, all designed to fit specific makes and model years.
The company focuses on Japanese and Korean vehicles, particularly Honda, Acura, Nissan, Infiniti, Hyundai, and Kia models from the 1990s onward. Their kits are sold through online retailers, suspension shops, and direct from TruHart's website. Installation requires mechanical skill or a shop with air suspension experience — this is not a bolt-and-go system for most owners.
Key Takeaways
- TruHart air suspension replaces coil or leaf springs with air springs controlled by a compressor and electronic management system, allowing you to adjust ride height and stiffness.
- Kits are model-specific and typically cost between $1,500 and $3,500 depending on the vehicle platform and whether you choose manual or full-digital control.
- Installation takes 8 to 16 hours at a shop and requires welding, electrical work, and brake line routing — not a DIY job for most owners.
- Air suspension lowers maintenance costs compared to coil springs over time but requires annual compressor and air line inspection to prevent leaks and system failure.
- TruHart systems are not street-legal in all states; some jurisdictions restrict lowered vehicles or require inspection certification before registration.
How the air spring and compressor work together
An air suspension system works by replacing your factory springs with rubber air springs — sealed chambers that hold pressurized air instead of metal coils. When you want to raise or lower the car, the compressor pumps air into or releases air from these chambers. The air pressure itself becomes the spring force, so higher pressure equals a stiffer, higher ride; lower pressure equals a softer, lower ride.
The compressor is usually mounted in the trunk or under the car and runs on 12-volt power from your battery. It fills a small air tank (called an accumulator) so the compressor does not run constantly. A valve block — the control center — sits between the tank and each air spring and directs air flow based on commands from the management system. Most TruHart kits include a manual three-button controller (up, down, off) or a full digital system with smartphone or touchscreen control that remembers multiple preset heights.
The system also includes air lines (usually braided nylon or rubber tubing) that run from the valve block to each corner of the car. These lines must be routed carefully to avoid heat sources, sharp edges, and moving suspension parts. A leak in any line or connection will cause the system to lose pressure and the car to sag — which is why annual inspection is important.
Installation requirements and what to expect at a shop
TruHart kits are not plug-and-play. Installation involves removing your factory suspension, welding new mounting brackets to the frame or subframe, installing the air springs and dampers, routing air lines and electrical wiring, and programming the management system. The job typically takes 8 to 16 hours depending on the vehicle and the shop's familiarity with TruHart systems.
Most shops that install air suspension charge labor rates between $85 and $150 per hour, so expect labor costs of $700 to $2,400 on top of the kit price. Some shops offer package pricing. You will also need to have your wheels aligned after installation, which adds another $100 to $200. If your car has factory electronic suspension or stability control, the shop may need to reprogram or disable certain modules to prevent conflicts with the air system — this can add cost and complexity.
Before choosing a shop, ask whether they have installed TruHart kits on your specific vehicle model. Shops with experience can often spot fitment issues early and know which brackets need modification. A shop unfamiliar with the brand may spend extra hours troubleshooting or may install the system incorrectly, leading to leaks or electrical problems later.
Cost breakdown: kit price, installation, and ongoing maintenance
TruHart air suspension kits range from roughly $1,500 to $3,500 depending on the vehicle platform and control system. A basic manual three-button kit for a Honda Civic or Acura TSX typically costs $1,800 to $2,200. A full digital system with smartphone control or a kit for a larger vehicle like an Infiniti Q50 or Nissan 350Z runs $2,500 to $3,500. Prices vary by retailer and whether you buy during a sale.
Total installed cost — kit plus labor plus alignment — usually falls between $2,500 and $5,900. A budget installation on a common platform might be $2,500 to $3,500; a full digital system on a less common vehicle could exceed $5,000. Get quotes from at least two shops before committing, because labor rates and experience vary widely.
Ongoing maintenance is modest compared to factory suspension. Air springs themselves last 5 to 10 years before the rubber degrades and leaks develop. The compressor typically lasts 8 to 12 years. Annual inspection of air lines, connections, and the compressor costs $50 to $150 at a shop. If a line develops a leak or a connection fails, repair costs range from $100 to $400 depending on what needs replacement. Replacing an air spring or the compressor runs $300 to $800 per component.
Ride quality, handling, and real-world performance
Air suspension offers a different driving experience than coil springs. Because air is compressible, the ride tends to be smoother and more compliant over bumps — the car absorbs impacts more gradually. This makes air suspension popular for show cars and street cruisers where comfort matters more than track performance. The trade-off is that air does not provide the precise, predictable feedback that a tuned coil spring setup delivers, so air suspension is rarely used on performance or racing vehicles.
Handling depends heavily on how the system is tuned. A poorly set up air suspension can feel mushy or unstable in corners because the air pressure changes as the car leans. A well-tuned system with proper damper settings and pressure curves can handle reasonably well, but it will never match a purpose-built coil spring setup. Most owners accept this trade-off because the ability to adjust ride height on the fly — lowering the car for a show, raising it for speed bumps — is worth the handling compromise.
One practical advantage: air suspension allows you to level the car under load. If you carry passengers or cargo, you can increase air pressure to keep the ride height constant, which is difficult with coil springs. This is especially useful for vehicles that sag noticeably when loaded.
Legal status and registration concerns
Air suspension itself is not illegal, but the modifications it enables — particularly lowering the vehicle — are restricted or banned in some states and cities. California, for example, allows lowering but requires the car to maintain a minimum ground clearance (usually 4.75 inches at the lowest point) and prohibits any part of the suspension from extending below the frame. Other states have similar rules or require inspection certification before registration.
Before installing a TruHart system, check your state's vehicle code or contact your local DMV to understand lowering restrictions. Some states require a safety inspection from a certified technician before you can register a lowered vehicle. A few jurisdictions prohibit lowering altogether or allow it only for specific vehicle types. Installing an air suspension system that violates local law can result in a failed inspection, registration denial, or fines.
If you plan to lower the car significantly, also verify that your insurance company will cover a modified vehicle. Some insurers charge extra for suspension modifications or require documentation that the work was done professionally. A few will not insure lowered vehicles at all.
Comparison with other suspension options
Air suspension is one of several ways to lower and customize a vehicle's ride. Coil-over kits (adjustable coil springs on dampers) are cheaper, easier to install, and offer better handling but do not allow on-the-fly height adjustment. Hydraulic suspension systems are more complex and expensive but offer smoother ride quality and are popular in show car circles. Factory electronic suspension (found on some luxury and performance vehicles) adjusts damping automatically but does not change ride height and costs thousands to repair if it fails.
For most owners, the choice comes down to budget and intended use. If you want a show car with smooth ride quality and the ability to adjust height, air suspension makes sense. If you want a performance car or track vehicle, coil-overs are the better choice. If you want simplicity and low cost, a basic lowering spring kit is the entry point, though it offers no adjustability and a harsher ride.
Frequently Asked Questions
Can I install a TruHart air suspension system myself?
Most owners cannot. The job requires welding, electrical work, brake line routing, and system programming. Unless you have suspension experience and a full shop setup, professional installation is necessary. Improper installation can cause leaks, electrical failures, or safety issues.
What happens if my air suspension develops a leak?
The car will gradually sag as pressure drops. Small leaks may take days or weeks to cause noticeable sagging; large leaks can drop the car to the ground in hours. Have the system inspected when ready to locate and repair the leak. Continuing to drive on a leaking system can damage the compressor and air springs.
Will air suspension affect my car's warranty?
Yes. Any suspension modification voids the factory suspension warranty and may void the powertrain warranty depending on your manufacturer's policy. Check your warranty documents or contact the dealer before installation. This is less of a concern for older vehicles out of warranty.
Can I use air suspension in winter or cold climates?
Yes, but air pressure changes with temperature. Cold air contracts, so your car will sit lower in winter unless you increase pressure manually. Most digital systems have temperature compensation built in. Manual systems require seasonal pressure adjustments.
How often do I need to service the compressor?
The compressor should be inspected annually for leaks, corrosion, and electrical connections. Most compressors do not require routine maintenance beyond visual inspection. If the compressor fails, it must be replaced — repair is not practical.