What Are Car Aero Parts? A Guide to Front Lips, Side Skirts & Diffusers
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If you want to change the appearance of your car without completely replacing the vehicle's body, aftermarket aero parts can be an effective way to give your car a more customized look.
But what exactly are car aero parts?
Aero parts are aftermarket exterior components designed to change the appearance and, depending on the design, the airflow around a vehicle. Common examples include front lips, side skirts, rear diffusers, spoilers, and other exterior trim pieces.
In this guide, we'll explain the most common types of car aero parts and what to consider before buying them.
What Is an Aero Part?
The term "aero part" is commonly used to describe aftermarket exterior components associated with a vehicle's aerodynamic styling.
Depending on the vehicle and product, an aero kit may include several components:
- Front lip or front splitter
- Side skirts
- Rear diffuser
- Rear spoiler
- Trunk spoiler
- Bumper extensions
- Other exterior aerodynamic trim
Some products are primarily designed for appearance, while certain aerodynamic components may also influence airflow around the vehicle.
What Is a Front Lip?
A front lip is installed along the lower portion of the front bumper.
One of the main reasons people install a front lip is to give the front end of the vehicle a more aggressive or sporty appearance.
Front lips are available in many styles and materials, including carbon fiber and other composite materials.
Fitment is especially important because front lips are generally designed for specific vehicle generations and bumper configurations.
For example, a front lip designed for a BMW G05 X5 may not fit another X5 generation or a different bumper configuration.
What Are Side Skirts?
Side skirts are exterior panels installed along the lower sides of a vehicle.
They can visually connect the front and rear of the vehicle and create a lower, more customized appearance.
Side skirts are commonly available for performance-oriented vehicles such as BMW M models, Audi S and RS models, Mercedes-Benz AMG models, and other enthusiast vehicles.
When purchasing side skirts, check the exact vehicle generation and body style.
What Is a Rear Diffuser?
A rear diffuser is generally located underneath or around the lower rear bumper area.
Diffuser designs can vary significantly between vehicles. Some are primarily styling components, while others are designed with aerodynamic considerations in mind.
Because rear bumper designs vary between trims and generations, checking fitment before ordering is important.
What Is a Trunk Spoiler?
A trunk spoiler is mounted on the rear trunk lid.
Spoilers are available in many different designs, from subtle OEM-style options to larger performance-inspired designs.
Carbon fiber trunk spoilers are particularly popular among enthusiasts who want to add a distinctive exterior detail without replacing the entire trunk or bumper.
Should You Buy an Individual Aero Part or a Full Kit?
That depends on the look you're trying to achieve.
An individual front lip or spoiler can be a relatively simple way to change one area of the vehicle.
A complete aero kit can provide a more consistent appearance because the front, sides, and rear are designed to work together visually.
Before purchasing a complete kit, verify exactly which components are included.
Some kits may include front splitters, side skirts, rear diffusers, and spoilers, while others may only include selected components.
Carbon Fiber Aero Parts
Carbon fiber is a popular material for aftermarket exterior parts because of its distinctive appearance and relatively high strength-to-weight characteristics.
You'll find carbon fiber options for many performance-oriented vehicles, including BMW, Mercedes-Benz, Audi, Porsche, Toyota, Nissan, and other brands.
The finish can also vary. For example, products may use different carbon fiber weave patterns or finishes.
Always check the product description for the exact material and construction.
How Do You Choose the Right Aero Part?
Before ordering an aftermarket aero part, check these details:
1. Vehicle Year
The same model name can cover several different generations.
2. Make and Model
A BMW 3 Series, for example, can have very different body designs depending on the generation.
3. Trim
M Sport, M Performance, AMG, S Line, and other trims may use different bumpers and exterior components.
4. Body Style
Sedan, coupe, convertible, hatchback, and SUV versions may require different parts.
5. Bumper Configuration
This is particularly important for front lips, splitters, and bumper-related products.
Final Thoughts
Aero parts can be a practical way to personalize the exterior appearance of your vehicle.
Whether you're looking for a front lip, side skirt, rear diffuser, spoiler, or complete carbon fiber kit, the most important step is making sure the product matches your exact vehicle configuration.
Before ordering, always check the listed year range, model, trim, body style, and fitment information.
At GetAutoPartsNow, you can find a range of aftermarket exterior parts for different vehicle applications, including front lips, side skirts, bumpers, grilles, spoilers, and other exterior accessories.
Looking for exterior upgrades? Explore our selection of aero parts and exterior styling products.