Types of RS5 Diffuser
The RS5 diffuser is a premium car accessory that enhances both performance and aesthetics. Popular among Audi enthusiasts, these diffusers improve aerodynamics while giving your vehicle a distinctive, sporty appearance.
Carbon Fiber RS5 Diffuser
The carbon fiber diffuser is the premium choice for performance-focused Audi RS5 owners. Made from lightweight, high-strength carbon fiber, this diffuser offers:
- Superior strength-to-weight ratio
- Enhanced downforce at high speeds
- Reduced aerodynamic drag
- Sleek, motorsport-inspired aesthetic
- Protection for the exhaust system
Best for: Performance enthusiasts seeking lightweight materials and racing aesthetics
Rear Diffuser for Audi RS5
The standard rear diffuser is designed to complement the RS5's aggressive styling while providing functional aerodynamic benefits. These diffusers typically feature:
- Compatibility with factory exhaust systems
- Improved airflow management
- Enhanced visual appeal
- Available in various finishes (gloss black, matte, etc.)
Best for: RS5 owners seeking balanced performance and style enhancements
Audi RS5 V6 Diffuser
Specifically engineered for V6-powered RS5 models, these specialized diffusers are designed to:
- Optimize airflow for the unique exhaust configuration
- Enhance stability at high speeds
- Complement the RS5 V6's power characteristics
- Provide model-specific mounting points
Best for: V6 RS5 owners looking for model-specific performance enhancements
Expert Tip: When selecting an RS5 diffuser type, consider not only aesthetics but also your driving style. For track day enthusiasts, the carbon fiber option offers the best performance benefits, while standard rear diffusers provide a good balance for daily drivers who want enhanced styling.
Specifications and Maintenance of RS5 Diffuser
| Specification | Description | Important Considerations |
|---|---|---|
| Material | Carbon fiber, ABS plastic, or polycarbonate | Carbon fiber offers the best strength-to-weight ratio but is most expensive |
| Design | Varied styling with different fin configurations | Design affects both aesthetics and aerodynamic performance |
| Size | Specific to RS5 model year and variant | Always verify compatibility with your exact model year |
| Mounting | Bolts, screws, or adhesive to rear bumper | Professional installation recommended for certain models |
| Compatibility | Varies by RS5 generation and model year | Check manufacturer specifications before purchase |
Essential Maintenance for RS5 Diffusers
Proper maintenance ensures your RS5 diffuser maintains both its appearance and performance benefits over time. Follow these key maintenance practices:
Clean your diffuser at least monthly using a soft brush, mild automotive soap, and warm water. For carbon fiber diffusers, use specialized carbon fiber cleaners to maintain the finish. Avoid high-pressure washers that could damage the material or loosen mountings.
Inspect your diffuser quarterly for cracks, chips, or loose mounting points. Pay special attention to the connection points with the bumper and look for signs of stress or fatigue, especially after driving on rough roads.
Apply a UV-resistant sealant designed for automotive components every 3-6 months. For carbon fiber diffusers, use a specialized carbon fiber protectant to prevent UV damage and maintain the glossy finish.
Check mounting hardware quarterly and after any significant impacts. Tighten any loose bolts to manufacturer specifications and replace any damaged mounting components immediately.
When replacement is necessary, use OEM or high-quality aftermarket parts designed specifically for the Audi RS5. Generic components may compromise both appearance and performance.
Warning: Neglecting diffuser maintenance can lead to reduced aerodynamic efficiency, potential damage to other components, and in extreme cases, the diffuser detaching at high speeds - creating a serious safety hazard.
How to Choose an RS5 Diffuser
Selecting the perfect RS5 diffuser requires careful consideration of several factors to ensure optimal performance, aesthetics, and compatibility with your vehicle.
Compatibility
Ensure perfect compatibility with your Audi RS5 by verifying:
- Exact model year and generation of your RS5
- Exhaust system configuration
- Any existing modifications that might affect fitment
- OEM vs. aftermarket bumper compatibility
Pro tip: Always request confirmation from the manufacturer that the diffuser will fit your specific vehicle
Material Selection
Choose based on your priorities:
- Carbon Fiber: Lightweight, premium appearance, highest durability ($$$$)
- Fiberglass: Good durability, moderate weight, customizable finish ($$$)
- ABS Plastic: Cost-effective, decent durability, various finishes ($$)
- Polyurethane: Flexible, impact-resistant, affordable ($)
Best value: ABS plastic offers the best balance of cost and performance for most owners
Design & Aerodynamics
Consider these design elements based on your goals:
- Fin configuration: More fins generally create better downforce
- Fin depth: Deeper channels improve air management
- Side extensions: Enhance visual impact and airflow control
- Exhaust integration: Must accommodate your existing exhaust setup
Performance focus: Choose designs with wind tunnel testing data if maximum performance is your goal
Expert Advice: For the best results, choose a diffuser from manufacturers specializing in Audi performance parts rather than generic aftermarket suppliers. Brands like ABT, Vorsteiner, and Maxton Design offer RS5-specific diffusers engineered for optimal performance.
| Selection Factor | Priority Level | Considerations |
|---|---|---|
| Brand Reputation | High | Research manufacturer history, customer reviews, and warranty options |
| Installation Complexity | Medium | Consider professional installation for complex designs or if you lack tools |
| Budget | Variable | Range from $300 (basic ABS) to $2,000+ (premium carbon fiber) |
| Aesthetic Alignment | High | Should complement other exterior styling elements of your RS5 |
| Future Modifications | Medium | Consider compatibility with planned exhaust or rear bumper upgrades |
How to DIY and Replace RS5 Diffuser
Required Tools & Materials
Tools Needed
- Screwdriver set (Torx and Phillips)
- Socket wrench set
- Trim removal tools
- Pliers (regular and needle-nose)
- Car jack and jack stands
- Work gloves
- Safety glasses
- LED work light
Materials Required
- New RS5 diffuser (compatible with your model)
- Replacement hardware (bolts, nuts, clips)
- Automotive adhesive (if required)
- Microfiber cloths
- Isopropyl alcohol (for cleaning surfaces)
- Thread-locking compound
Step-by-Step Installation Guide
Park your Audi RS5 on a level surface and engage the parking brake. Allow the exhaust system to cool completely if the vehicle has been driven recently. Disconnect the negative terminal of the battery to prevent electrical issues during installation.
Using a hydraulic jack, carefully lift the rear of the vehicle according to the manufacturer's recommended jacking points. Secure the vehicle with jack stands rated for your RS5's weight. Never rely solely on a hydraulic jack for support during installation.
If your RS5 has an undertray or splash guards, remove these first by locating and removing the fasteners (typically Torx screws). Store these components and their hardware in labeled containers to ensure proper reassembly.
Identify all mounting points of the current diffuser. These typically include both visible exterior bolts and hidden fasteners accessed from underneath. Use appropriate tools to remove all hardware, keeping track of the location and type of each fastener.
Pro Tip: Take photos before and during disassembly to document the original configuration, which will serve as a reference during reassembly.
With all fasteners removed, carefully detach the diffuser from the bumper. Some models may use adhesive in addition to mechanical fasteners. If you encounter resistance, gently work around the edges with plastic trim tools to release any clips or adhesive bonds.
Before installation, inspect your new RS5 diffuser for any manufacturing defects or shipping damage. Clean the mounting surfaces on both the diffuser and the vehicle using isopropyl alcohol and allow to dry completely.
Position the new diffuser against the bumper without securing it to verify proper alignment with the exhaust outlets and bumper contours. Make note of all mounting points and ensure they align with the vehicle's attachment points.
With alignment confirmed, secure the diffuser using the provided hardware or OEM fasteners from the original diffuser. Start with center mounting points and work outward, leaving all fasteners loose until all are in place. Apply thread-locking compound to bolts if recommended by the manufacturer.
Once all fasteners are in place, tighten them to the manufacturer's specifications in a cross-pattern to ensure even pressure distribution. Be careful not to overtighten, especially with carbon fiber diffusers that can crack under excessive pressure.
Reinstall any undertray components or splash guards that were removed earlier, using the original hardware and ensuring proper alignment.
Carefully lower the vehicle from the jack stands. Perform a thorough visual inspection of the installation, checking for proper alignment, secure fasteners, and adequate clearance around exhaust components.
Safety Warning: If you're uncomfortable with any aspect of this installation, consult a professional. Improper installation could lead to the diffuser detaching during driving, creating a road hazard and potential damage to your vehicle.
Frequently Asked Questions
No, not all cars have a diffuser. Diffusers are primarily found on high-performance vehicles, sports cars, and racing cars where aerodynamic efficiency is crucial. The Audi RS5, being a high-performance vehicle, comes with a factory diffuser designed to enhance its aerodynamic capabilities at higher speeds. Economy cars and standard sedans typically lack this feature as their design priorities focus more on fuel efficiency and practicality rather than high-speed performance.
Yes, the Audi RS5 comes standard with a rear diffuser as part of its performance-oriented design. The factory RS5 diffuser is engineered to manage airflow under the vehicle and reduce aerodynamic lift at high speeds. It's integrated into the rear bumper design and works in conjunction with other aerodynamic elements to optimize the car's performance characteristics. The diffuser also contributes to the RS5's distinctive sporty appearance, setting it apart from standard A5 models.
Yes, the Audi RS5 diffuser can be upgraded with aftermarket options. Many performance-oriented companies offer enhanced diffuser designs that provide:
- Improved aerodynamic efficiency and downforce
- More aggressive styling and visual impact
- Lightweight construction using premium materials like carbon fiber
- Optimized airflow management for better high-speed stability
When upgrading, it's essential to select a diffuser specifically designed for your RS5's model year and generation to ensure proper fitment and function. Quality aftermarket diffusers typically range from $400-$2,000 depending on materials and design complexity.
RS5 diffusers are manufactured using several different materials, each with distinct characteristics:
| Material | Characteristics | Best For |
|---|---|---|
| Carbon Fiber | Extremely lightweight, high strength, premium appearance | Performance enthusiasts, weight reduction, upscale aesthetic |
| ABS Plastic | Durable, cost-effective, good impact resistance | Budget-conscious upgrades, daily drivers |
| Polyurethane (PU) | Flexible, resistant to cracking, affordable | Street use, durability over rough surfaces |
| Fiberglass | Moderate weight, good strength, less expensive than carbon fiber | Mid-range performance upgrades, customizable finishes |
Factory RS5 diffusers typically use high-quality plastics, while premium aftermarket options often feature carbon fiber construction for ultimate performance and visual appeal.
A properly designed RS5 diffuser enhances vehicle performance through several aerodynamic principles:
- Reduced Drag: The diffuser creates a controlled expansion area for air flowing under the car, reducing turbulence and aerodynamic drag
- Increased Downforce: By accelerating airflow underneath the vehicle, the diffuser creates a low-pressure area that pulls the car toward the road
- Improved Stability: Enhanced downforce on the rear axle improves high-speed stability and cornering capability
- Wake Management: The diffuser helps manage the turbulent wake behind the vehicle, reducing aerodynamic inefficiency
These performance benefits become increasingly significant at higher speeds, making a quality diffuser particularly valuable for track driving or high-speed highway use.