What to Consider When Buying Suspension

This article was written by Coilovers.com Owner and Principal, Lou Tortola.

Suspension is one of the most important aftermarket purchases you will make for your car. The right kit, whether it is lowering springs, a full coilover kit, or something else, changes how the car corners, brakes, handles rough pavement, and feels every time you drive it. You have to get it right the first time, because fixing a bad suspension purchase costs twice as much as buying the right kit up front.

If you are shopping for suspension and the component list feels overwhelming, this is the straight-talk buyer's guide we give customers every day on the phone. Here is what each part does, which kit type fits which driver, and the real tips that separate a good purchase from an expensive mistake.

The Main Suspension Parts, Explained

Springs

The spring is the energy-storing component of the suspension. It absorbs road impacts, supports the car's static weight, and controls body roll through corners. Spring rate, measured in pounds per inch or kilograms per millimeter, is the single most consequential tuning variable in any setup. Get the rate wrong for your car and driving style and nothing else in the setup can compensate.

Dampers (Shocks or Struts)

The damper controls how the spring moves through the suspension stroke. Without damping, a spring would bounce forever after every bump. The damper converts spring energy into heat through hydraulic resistance and keeps the tire in contact with the pavement. Monotube designs respond faster. Twin-tube designs tend to ride softer on the street. Both are valid depending on how the kit is engineered.

Coilovers

A coilover kit integrates the spring and damper into one assembly at each corner, mounted on a threaded shock body with a locking collar that sets ride height. The design reduces unsprung weight compared to many factory setups and delivers adjustability the factory setup cannot match. A coilover kit is the most common performance suspension upgrade for enthusiasts who want real control over how the car handles.

Sway Bars

Sway bars, also called anti-roll bars, connect the left and right sides of the suspension and resist body roll in corners. Stiffer bars reduce roll and shift the car's cornering balance. They are a meaningful complement to a proper coilover kit and often one of the most cost-effective handling upgrades available.

Control Arms

Control arms connect the wheels to the chassis. Each arm affects caster, camber, or toe, and upgraded arms are commonly used to restore or fine-tune suspension geometry after a ride height change. On lowered cars, adjustable control arms are often needed to correct the geometry back to spec.

Tie Rods

Tie rods connect the steering rack to each front wheel and transmit steering input to the tires. They do not typically change with a suspension upgrade, but their length and geometry matter on dropped cars and sometimes need adjustment during an alignment.

Tip 1: Choose the Suspension Type That Matches Your Goals

Three main aftermarket suspension categories exist. Lowering springs, coilovers, and air suspension.

Lowering Springs

If you want to keep most of the factory suspension and simply drop the ride height, lowering springs are the budget-friendly starting point. They replace the factory springs with shorter, stiffer units while keeping the factory dampers in place. Cost is low and installation is straightforward. On newer cars with active suspension, lowering springs are often all the factory damping can handle.

Coilover Kits

The most common choice among enthusiasts who want real handling improvement, better stance, and genuine adjustability. A coilover kit gives you ride height adjustment, damping control on most kits, and matched spring and damper engineering from brands like BC Racing, KW Suspension, Fortune Auto, Tein, Bilstein, Ohlins, and Feal. For serious street and track use, this is the default answer.

Air Suspension

Air suspension replaces the springs with air bags and adds a management system to control pressure. The unique benefit is active ride height adjustment, raising or dropping the car on demand. Air suspension is the most expensive category and carries ongoing maintenance requirements the other two do not. It makes sense for show cars, stance builds, and specific lifestyle uses. For pure handling performance, a proper coilover kit remains the stronger choice.

Tip 2: Understand Your Options and Price Band

Once you have chosen the suspension type, start looking at brands and price bands. Avoid both underpaying and overpaying. You do not want a cheap kit that is not up to par with how you drive. You also do not want a premium race kit if a mid-tier street setup would serve you better.

Three common price bands help frame the decision.

Tip 3: Do the Research Before You Buy

Read reviews. Watch installation videos. Pull up write-ups on your specific chassis and platform. Suspension is a significant investment and the kit stays with the car for years, so the research up front pays off every time. Look for real owner experiences on your exact year, make, model, and trim rather than generic brand testimonials.

Pay attention to what owners say about ride quality over time, not just on day one. Check how the kit handles your local road conditions. Cold-weather behavior, salt belt corrosion resistance, and heat-soak performance all matter depending on where you live and how you drive.

Tip 4: Work With a Dealer That Actually Helps

This is the secret weapon most buyers miss. The biggest problem in this industry is that too few vendors are equipped or willing to provide real customized support before and after the sale. Anyone can take an order. Not everyone stays involved once the box ships.

Our parts division has delivered over 20,000 coilover kits since we started Coilovers.com, and that volume was built on one principle. Every customer gets as much attention as they need, for as long as they need it. We answer our phones during business hours. We reply to emails. We stay engaged until the kit is on the car and you are happy with how it drives.

A Few Final Considerations

Budget for installation if you are not doing it yourself. Budget for an alignment after the install, which is non-negotiable on any kit. Budget for possible geometry correction parts such as camber arms on lowered cars. The full cost of a suspension project is the kit plus the install plus the alignment plus any ancillary parts your specific setup requires.

Plan for lead times. Some kits ship fast. Others come from build-to-order production queues that can run three to twelve weeks. Tell the dealer your timeline before you commit so they can match you to a kit that actually shows up in your window.

Frequently Asked Questions