What people modify on a Kia Soul, and why

Kia Soul owners modify their vehicles for three main reasons: to change how the car looks, to improve how it drives, or to add features the factory version didn't include. The most common modifications fall into appearance (wheels, paint, body kits), performance (suspension, exhaust, engine tuning), and convenience (infotainment systems, lighting). Most people start with appearance changes because they're reversible and don't require mechanical knowledge, then move to performance or tech upgrades if they want to go deeper.

The cost range is enormous — from $200 for new floor mats to $5,000 or more for a full suspension overhaul. What you spend depends on whether you're doing it yourself, whether you're keeping the car long-term, and whether you care about resale value. Some modifications actually hurt resale value (extreme lowering, engine modifications that void the warranty), while others like a quality infotainment upgrade or new wheels tend to hold their appeal.

Key Takeaways

  • Wheel and tire upgrades are the most popular first modification because they change the look when ready and cost between $600 and $1,500 for a full set installed.
  • Suspension modifications (lowering springs, coilovers) range from $400 to $2,000 and affect both how the car looks and how it handles, but may reduce ground clearance and ride comfort.
  • Exhaust system replacements cost $300 to $800 and change the engine sound, but some aftermarket exhausts trigger check-engine lights or fail emissions testing depending on your state.
  • Infotainment upgrades (new head unit, Apple CarPlay, backup camera) typically run $400 to $1,200 installed and don't affect the car's mechanical systems.
  • Engine tuning through a reflash or piggyback module costs $300 to $600 but may void your factory warranty and is not reversible without professional help.

Appearance modifications: wheels, paint, and body kits

Wheels are where most Soul owners start. A set of four aftermarket wheels with tires installed typically costs $600 to $1,500 depending on the brand, size, and whether you go to a tire shop or a specialty wheel retailer. Popular sizes for the Soul are 17 and 18 inches; going larger than 18 inches can rub against the wheel well or suspension parts, especially if you lower the car. Brands like Konig, Rotiform, and TSW are common in the Soul community, but you'll also find budget options from brands like Rota or Enkei.

Window tinting is the second most common appearance mod. Professional tinting costs $150 to $400 depending on how many windows and the darkness level (measured in VLT, or visible light transmission). Check your state's tinting laws — many states have a legal minimum VLT, usually 35 percent, and police can ticket you for going darker. Tinting is reversible if you want to remove it later.

Vinyl wraps for the hood, roof, or full body are more expensive and permanent-looking. A full wrap runs $2,000 to $4,000 professionally installed, though partial wraps (hood or roof only) cost $300 to $800. Wraps can hide the original paint and are removable, but they require professional installation to avoid bubbles and peeling.

Body kits (front splitters, side skirts, rear diffusers) cost $400 to $1,500 for the parts alone, plus $200 to $500 for installation if you're not doing it yourself. They're mostly visual — they don't improve aerodynamics on a car as small as the Soul — but they do change the stance and look. Cheap kits may not fit perfectly or may crack easily; quality matters here.

Suspension modifications: lowering and handling

Lowering springs are the entry point to suspension work. A set costs $150 to $400 for the parts, plus $200 to $400 for installation at a shop. Springs lower the car by 1 to 1.5 inches and make it sit more aggressively, but they don't let you adjust the height later. The ride becomes stiffer because the springs are wound tighter, and you may hear more road noise.

Coilovers are the next step up: a complete suspension system where each wheel has its own spring and damper (shock absorber) combined into one unit. A quality set runs $800 to $2,000 installed. The advantage is that you can adjust the height and stiffness to your preference, and you can fine-tune how the car handles in corners. The downside is complexity — if something breaks, repair costs are higher than with springs alone, and installation is more involved.

Lowering a Soul affects ground clearance. The Soul already sits lower than an SUV, and dropping it another inch or two means you'll scrape on steep driveways, parking lot ramps, or speed bumps. Some owners add a front splitter or air dam, which looks good but makes this problem worse. If you live somewhere with rough roads or snow, lowering may not be practical.

Sway bars and strut braces ($200 to $600 installed) reduce body roll in corners without lowering the car. They're useful if you want better handling but don't want the look or the ground clearance penalty of lowering.

Exhaust and engine modifications

An aftermarket exhaust system replaces the factory muffler and sometimes the catalytic converter and resonator. Costs range from $300 for a muffler-only swap to $800 for a full catback system (everything behind the catalytic converter). Popular brands include Magnaflow, Borla, and HKS. The main appeal is sound — a good exhaust gives the Soul a sportier tone without being obnoxiously loud.

The catch: some aftermarket exhausts trigger a check-engine light because they alter oxygen sensor readings or remove the resonator that the engine computer expects. If you live in a state with emissions testing, a non-compliant exhaust can cause you to fail inspection. Before buying, check reviews from other Soul owners in your state to see if the exhaust passes testing.

Engine tuning through a reflash (reprogramming the engine computer) or a piggyback module (a device that intercepts sensor signals) costs $300 to $600. This can add a few horsepower and improve throttle response, but it voids your factory warranty and may cause issues with emissions or reliability. Reflashes are permanent; piggyback modules can be removed, but reflashes require a professional to reverse. Most tuning shops will not touch a Soul under warranty, and some tuning can cause the check-engine light to come on.

Intake modifications (cold air intakes, short ram intakes) cost $150 to $400 and claim to improve airflow to the engine. Real-world gains are small on a naturally aspirated engine like the Soul's, and some intakes can actually hurt fuel economy or trigger the check-engine light if they disturb the mass airflow sensor.

Interior and technology upgrades

A new head unit (the main dashboard screen and stereo) is one of the most practical upgrades. A quality unit with Apple CarPlay, Android Auto, and a backup camera runs $400 to $1,200 installed. Installation usually takes 1 to 2 hours at a car audio shop. This upgrade doesn't affect the car's mechanical systems and is fully reversible — you can sell the old head unit or reinstall it if you sell the car.

Backup cameras and parking sensors ($150 to $400 installed) add safety and convenience, especially if your Soul didn't come with them from the factory. Most require running wires through the dashboard and bumper, so professional installation is recommended.

LED interior lighting ($50 to $200) replaces the factory dome lights, map lights, and door lights with brighter, longer-lasting LEDs. This is a popular DIY modification because the bulbs usually pop out without tools. It doesn't affect performance or resale value.

Seat covers and floor mats ($100 to $400) protect the interior and let you customize colors. They're reversible and don't require installation at a shop.

What modifications affect warranty and resale value

Kia's factory warranty covers defects in materials and workmanship for three years or 36,000 miles (whichever comes first) on most components. Modifications don't automatically void the entire warranty, but they can void coverage for the parts you modified and any related systems. For example, an engine tune might void the powertrain warranty, and lowering springs might void the suspension warranty.

Resale value is harder to predict. Tasteful modifications like quality wheels, a new head unit, or a professional paint job may appeal to the next buyer. Extreme modifications like a full wrap, aggressive lowering, or engine tuning often turn buyers away because they signal heavy use or potential reliability issues. If you plan to sell the car in a few years, keep modifications reversible and document everything you've done.

DIY versus professional installation

Some modifications are DIY-friendly: wheels and tires (if you have a jack and lug wrench), LED bulbs, floor mats, and basic bolt-on parts like sway bars. Others require specialized tools or knowledge: suspension work, exhaust installation, head unit wiring, and engine tuning. A mistake during DIY installation can cost more to fix than professional installation would have cost in the first place.

If you're not experienced with car work, budget for professional installation. A good shop will warranty their work and catch problems before they become expensive. Expect to pay $100 to $200 per hour for labor, depending on your location and the shop's reputation.

Frequently Asked Questions

Will lowering my Soul damage it?

Lowering itself doesn't damage the car, but it does reduce ground clearance and can cause scraping on driveways, ramps, and speed bumps. Coilovers are safer than springs because you can adjust the height if you hit something. Lowering also puts more stress on suspension components over time, so quality parts matter.

Does a new exhaust really add horsepower?

A catback exhaust (muffler and resonator) adds minimal horsepower on a stock Soul — usually 2 to 5 hp at most. The main benefit is sound and a slightly faster throttle response. If you want real power gains, you'd need engine tuning, but that comes with warranty and reliability risks.

Can I install a head unit myself?

If you're comfortable with wiring and removing dashboard panels, yes. Most head units come with a wiring harness that plugs into the factory connectors. However, if something goes wrong, you could damage the electrical system. Professional installation usually costs $100 to $200 and includes a warranty on the work.

What's the most popular Soul modification?

Wheels are by far the most common — almost every modified Soul has an aftermarket wheel and tire set. They're affordable, reversible, and when ready visible. Suspension lowering and exhaust systems are the next most popular, followed by head unit upgrades.

Do I need to tune my engine if I add an exhaust?

No. An exhaust alone works fine without tuning. Tuning is optional and mainly benefits people who want to squeeze out extra performance. Some people add tuning later if they want more power, but it's not necessary for an exhaust to function.