CLA Aerodynamics Kit: Your Ultimate Upgrade

A CLA aerodynamics kit is a performance and visual upgrade for your Mercedes-Benz CLA, designed to improve airflow, reduce drag, and enhance stability, while also giving your car a more aggressive, sporty look. This guide breaks down what it is, its benefits, and how to choose the right one for your CLA.

Owning a Mercedes-Benz CLA means appreciating a blend of luxury, performance, and striking design. But like any automotive enthusiast, you might be wondering if there’s a way to push its capabilities and aesthetics even further. That’s where an aerodynamics kit comes in, often referred to as a body kit or aero kit. It’s a common upgrade for those looking to fine-tune their CLA’s performance and give it a truly unique stance on the road. If you’ve seen CLA models with more pronounced spoilers, diffusers, or side skirts and wondered what they do, you’re in the right place. We’ll demystify CLA aerodynamics kits, explore their advantages, and guide you through selecting the perfect one for your needs. Get ready to understand how these carefully designed components can transform your driving experience.

What Exactly is a CLA Aerodynamics Kit?

At its core, a CLA aerodynamics kit is a collection of exterior body components designed to optimize how air flows around your vehicle. Think of it as giving your CLA a meticulously sculpted suit that’s both stylish and functional. These kits typically replace or augment factory parts with specially shaped pieces that influence air pressure, lift, and drag. The primary goal is to improve stability, especially at higher speeds, and to enhance the car’s visual appeal by giving it a more aggressive and performance-oriented look.

While often associated with racing, the principles of aerodynamics — the study of how air interacts with moving objects — are crucial even for road cars. A well-designed kit can make your CLA feel more planted, responsive, and confident on the road, all while turning heads.

Key Components of an Aerodynamics Kit

A comprehensive CLA aerodynamics kit usually consists of several integrated parts, each serving a specific purpose:

• Front Lip Spoiler (or Front Splitter): This piece attaches to the lower edge of the front bumper. It helps to reduce the amount of air that goes underneath the car, creating a pocket of higher pressure above it, which in turn can reduce front-end lift and improve steering response.
• Side Skirts: These run along the bottom edge of the car between the front and rear wheels. They help to manage airflow along the sides of the vehicle, smoothing the transition of air and reducing turbulence. This can also help to reduce lift and improve stability.
• Rear Diffuser: Located at the lower rear bumper, the diffuser is a series of strategically shaped fins or channels. Its purpose is to accelerate the airflow exiting from under the car. This creates a low-pressure zone, which helps to pull the rear of the car down, increasing downforce and stability at the rear. You’ll often see these on performance cars, including many AMG models.
• Rear Spoiler (or Wing): This is perhaps the most recognizable aerodynamic component. Mounted on the trunk lid or rear of the roof, a spoiler’s primary function is to disrupt or redirect airflow to reduce high-pressure build-up on the rear surface of the car. This reduction in pressure helps to create downforce at the rear, significantly improving stability and traction. For a CLA, this might range from a subtle lip spoiler to a more pronounced wing.
• Canards (or Dive Planes): Less common on typical road kits but found on more aggressive track-focused designs, canards are small winglets at the corners of the front bumper. They help manage airflow at the front corners, directing air away from sensitive areas and contributing to front-end downforce.

Materials and Construction

The materials used in aerodynamics kits significantly impact their durability, weight, and cost. High-quality kits often utilize:

• Fiberglass (FRP – Fiberglass Reinforced Plastic): A common and cost-effective option. It’s relatively easy to mold into complex shapes but can be heavier and more prone to cracking than other materials if not manufactured to a high standard.
• Carbon Fiber: The premium choice. It’s incredibly strong, lightweight, and offers a high-tech, racing-inspired aesthetic. It resists corrosion and is generally more durable than fiberglass, but comes with a higher price tag. You can often find carbon fiber parts with visible weave patterns for an extra visual flair.
• Polyurethane (PU): Often used for more flexible components like front lips or side skirts that might encounter minor impacts. It offers good impact resistance and is less likely to crack than fiberglass.

Why Upgrade Your CLA with an Aerodynamics Kit?

Beyond the obvious aesthetic enhancements, a well-chosen CLA aerodynamics kit offers tangible benefits that can improve your driving experience. These advantages cater to both the performance-minded driver and the enthusiast who simply wants their car to look its best.

Performance and Handling Benefits

The engineering behind aerodynamics aims to make cars more stable and efficient, and a kit can amplify these effects:

• Reduced Drag: Smoother airflow means less resistance from the air. This can lead to slightly improved fuel efficiency at highway speeds and potentially higher top speeds, though the latter is less relevant for most road driving.
• Increased Downforce: This is a critical benefit. Downforce is the aerodynamic force that pushes the car’s tires into the road surface. More downforce means better grip, especially during cornering and braking. This translates to increased stability and confidence when driving at speed or tackling winding roads.
• Improved Stability: By managing airflow and reducing lift at both the front and rear, an aerodynamics kit can make the car feel more planted and predictable, especially in crosswinds or during high-speed maneuvers.
• Enhanced Cooling (Sometimes): While not the primary function of all kits, some designs, particularly those with larger air intakes, can improve airflow to cooling systems like radiators and intercoolers, which can be beneficial for performance driving.

Aesthetic Enhancements

This is often the most immediate and noticeable benefit for many owners:

• Sportier, More Aggressive Look: Aerodynamics kits are designed to give the CLA a more dynamic and purposeful appearance, often mimicking the styling of performance variants or aftermarket tuners.
• Personalization: These kits allow you to express your individual style and differentiate your CLA from others, creating a unique visual identity.
• Enhanced Presence: A well-designed kit can make the car appear lower, wider, and more muscular, giving it a commanding presence on the road.

Benefit Category	Description	Impact
Performance	Reduced Lift, Increased Downforce	Improved grip, stability, and handling confidence, especially at speed.
Performance	Reduced Drag	Slightly better fuel economy on the highway and potential for higher top speeds.
Aesthetics	Aggressive, Sporty Styling	Enhanced visual appeal, personalization, and a unique look.
Aesthetics	Lower, Wider Stance	Increased road presence and a more muscular appearance.
Functionality	Potential for Improved Cooling	Better thermal management for engine and brake components under load.

Considerations for Road vs. Track Use

It’s important to distinguish between kits designed for road use and those intended for track performance. Road kits primarily focus on enhancing aesthetics with moderate aerodynamic improvements and ensuring legal compliance regarding ground clearance and safety. Track kits, on the other hand, prioritize maximum downforce and functional aerodynamics, often at the expense of practicality and road legality. For most CLA owners, a street-oriented kit will provide the best balance.

Choosing the Right CLA Aerodynamics Kit for You

Selecting the perfect aerodynamics kit involves more than just picking the one that looks best. You need to consider compatibility, quality, your intended use, and budget. Here’s a breakdown of factors to keep in mind:

Compatibility is Key

Not all kits are created equal, and different CLA generations and sub-models may require specific parts. Always verify that the kit is designed for your exact CLA model year and trim (e.g., CLA 250, CLA 35 AMG, CLA 45 AMG). A mismatch can lead to improper fitment, requiring expensive modifications or rendering the parts unusable.

Quality of Materials and Fitment

A poorly made kit can be worse than no kit at all. Look for manufacturers with a good reputation for producing high-quality parts. Key indicators include:

• Material Strength and Finish: Check reviews regarding the material (fiberglass, carbon fiber, PU) and how well it’s finished. A smooth, durable finish is essential.
• Fitment Precision: The best kits are designed using precise measurements of the vehicle, ensuring that mounting points align perfectly with the factory bodywork. Poor fitment can result in gaps, misalignments, and a cheapened appearance.
• Mounting Hardware: Reputable kits often include all necessary mounting hardware and detailed installation instructions.

Style and Design Integration

Consider how the kit’s design complements your CLA’s existing lines. Do you want a subtle enhancement or a dramatic transformation? Some kits are designed to be subtle, almost like factory sport packages, while others are bold and aggressive. Think about the overall look you’re aiming for.

OEM vs. Aftermarket:

• OEM (Original Equipment Manufacturer) Parts: If available from Mercedes-Benz or AMG directly, these offer guaranteed fitment and a look designed by the manufacturer. However, they can be the most expensive option.
• Reputable Aftermarket Brands: Many specialized tuning companies produce high-quality, stylish aerodynamics kits for Mercedes-Benz vehicles. These can offer excellent value and a wider range of designs. Research brands like 3D Design, Akrapovič (for exhaust systems often paired with aero), Prior Design, or Mansory (for more extreme designs), and look for brands specifically known for Mercedes-Benz applications.

Budget and Installation Costs

Aerodynamics kits vary significantly in price. Carbon fiber components will be considerably more expensive than fiberglass or polyurethane. Remember to factor in installation costs if you’re not doing it yourself. Professional installation can range from a few hundred to over a thousand dollars, depending on the complexity of the kit and the labor rates in your area.

Legal and Practical Considerations

Depending on your location and local regulations, certain aerodynamic enhancements might affect your vehicle’s compliance with road laws. Specifically, things like extreme front splitters or very low ride heights can be an issue. Ensure the kit you choose maintains a reasonable ground clearance for everyday driving and doesn’t obscure essential lighting or safety features. For more on vehicle modification legality, consulting your local Department of Motor Vehicles (DMV) or equivalent authority is recommended.

Installation Guide for a CLA Aerodynamics Kit

Installing an aerodynamics kit can range from a straightforward DIY project to a more involved process requiring professional expertise. The complexity largely depends on the specific components and the quality of the kit. Below is a general outline of what’s typically involved. For precise instructions, always refer to the manufacturer’s specific installation manual.

Tools and Materials You May Need

Before you begin, gather the necessary tools and supplies:

• Comprehensive socket set and wrenches
• Screwdrivers (Phillips and flathead)
• Drill and drill bits (for making new mounting holes)
• Measuring tape and painter’s tape
• Panel removal tools
• Adhesive promoter or primer
• Automotive-grade adhesive/sealant (e.g., 3M VHB tape, silicone sealant)
• Rivets or automotive-grade bolts and nuts
• Safety glasses and gloves
• Jack stands and wheel chocks (if the car needs to be lifted)
• A helper is often recommended for positioning larger parts.

Step-by-Step Installation Overview

This is a generalized guide. Always consult the specific instructions provided by the kit manufacturer.

1. Preparation:
   • Clean the vehicle thoroughly, especially the areas where the new components will be attached.
   • For parts that require drilling into the car’s bodywork, use painter’s tape to mark the exact locations of holes.
   • If lifting the car, ensure it is securely supported on jack stands on a level surface. Use wheel chocks for safety.
2. Install Front Lip Spoiler:
   • Align the front lip with the bottom edge of the front bumper.
   • Many lips attach using existing mounting points or require drilling new holes.
   • Secure the lip using the provided bolts, screws, or rivets. Apply automotive adhesive for a stronger bond if recommended.
3. Install Side Skirts:
   • Position the side skirts along the rocker panels to check alignment.
   • Many side skirts attach using screws into the underside of the rocker panel and clips. Some may require drilling through the bodywork.
   • Ensure the skirts are flush and properly aligned before fully tightening fasteners.
4. Install Rear Diffuser:
   • This often replaces the factory lower bumper trim.
   • Carefully remove the factory diffuser or lower trim pieces.
   • Align the new diffuser and secure it using the provided hardware, which may include clips, screws, or bolts.
5. Install Rear Spoiler:
   • For a trunk-mounted spoiler, precise alignment is crucial.
   • Use the template (if provided) or careful measurements to mark drilling locations on the trunk lid.
   • Drill pilot holes and then enlarge them as needed.
   • Clean the mounting surfaces and apply an adhesive sealant to the underside of the spoiler.
   • Mount the spoiler and secure it with bolts from underneath. For wing-type spoilers mounted on the fenders, the process can be more involved.
6. Final Checks:
   • Ensure all fasteners are securely tightened.
   • Check for any gaps or misalignments.
   • Clean any excess adhesive or sealant.
   • Torque bolts to manufacturer specifications if provided; do not overtighten.

When to Seek Professional Installation

If you are uncomfortable with drilling into your car’s body, working with intricate clips, or lack the necessary tools, it’s best to have the kit professionally installed. Body shops specializing in automotive customization or dealerships can ensure a perfect fitment and finish. This is especially true for more complex kits or those made from delicate materials like carbon fiber.

Maintaining Your CLA Aerodynamics Kit

Once installed, proper maintenance will keep your aerodynamics kit looking sharp and performing optimally. Treat these components with care, just as you would the rest of your CLA’s exterior.

Cleaning Your Aero Parts

• Regular Washing: Wash your car regularly using a pH-neutral car wash soap and plenty of water. Use a soft microfiber wash mitt to avoid scratching the surface.
• Drying: Dry the car immediately with a clean microfiber drying towel to prevent water spots.
• Stubborn Grime: For tougher dirt or insect residue, use a dedicated automotive bug and tar remover. Always test in an inconspicuous area first.

Protecting the Finish

• Waxes and Sealants: Apply a quality car wax or synthetic paint sealant periodically (e.g., every 3-6 months) to protect the finish and make future cleaning easier. For carbon fiber parts, a ceramic coating can offer excellent long-term protection and a deep gloss.
• Paint Protection Film (PPF): For valuable or high-end kits, consider applying a clear paint protection film to guard against stone chips,