PORSCHE 991-504-257-99 Lower Rear Diffuser 911R GT3RS

( Manufacturer Part Number: 991-504-257-99 ), ( Country Of Origin: Germany )

Review PORSCHE Lower Rear Diffuser 991 And Genuine fits GT3

The Porsche 991-504-257-99 lower rear diffuser is an authentic and exceptional accessory designed specifically for the Porsche 911R, GT3, and GT3 RS models. This component is meticulously engineered to enhance the vehicle's aerodynamic performance, providing a more stable and balanced driving experience.

The lower rear diffuser boasts a sleek and stylish design, perfectly integrating with the 911's existing rear bumper. Manufactured from high-quality, lightweight materials such as carbon fiber or fiberglass, this diffuser not only adds an aesthetic appeal but also reduces weight, contributing to improved overall performance.

The diffuser's primary function is to increase downforce at the rear axle. By directing and channeling airflow effectively, it helps to maintain better traction and grip on the road or track. This results in improved stability during high-speed cornering and acceleration.

The Porsche 991-504-257-99 lower rear diffuser is a direct-fit replacement component, making installation straightforward and hassle-free. It comes with all necessary mounting hardware and instructions, ensuring a seamless integration process.

This diffuser not only offers performance benefits but also adds a touch of exclusivity and individuality to your Porsche 911R, GT3, or GT3 RS. With its precision engineering and high-quality construction, it is an essential addition for any enthusiast seeking to optimize their vehicle's performance and appearance.

Porsche 991 Lower Rear Diffuser (504-257-99) for 911R, GT3, GT3RS: A Comprehensive Analysis

The Porsche 991 lower rear diffuser (504-257-99) is a popular aftermarket part for the 911R, GT3, and GT3RS models. This component is designed to enhance the aerodynamic performance of these high-performance vehicles. In this analysis, we will discuss the potential pros and cons of investing in this lower rear diffuser.

1. Improved Downforce: The primary function of a diffuser is to increase downforce, which in turn improves traction and stability, especially during high-speed cornering. This can lead to better handling and overall performance.

2. Enhanced Aesthetics: The lower rear diffuser not only serves a functional purpose but also significantly contributes to the vehicle's appearance. It gives the rear end of the car a more aggressive and sporty look.

3. Durability: Porsche OEM parts are known for their high-quality materials and robust construction. This lower rear diffuser is no exception, ensuring long-lasting performance and resistance to wear and tear.

4. Compatibility: The 504-257-99 lower rear diffuser is specifically designed for the Porsche 991 911R, GT3, and GT3RS models, ensuring a perfect fit and seamless integration with the vehicle.

1. Cost: Aftermarket parts like the lower rear diffuser can be quite expensive. This investment may not be feasible for everyone, especially those on a tight budget.

2. Installation Complexity: Installing the lower rear diffuser can be a complex process that may require professional assistance. This can add to the overall cost of the upgrade.

3. Noise: Some users have reported an increase in exhaust noise after installing the lower rear diffuser. While this may be desirable for some, it could be a drawback for others seeking a quieter driving experience.

In conclusion, the Porsche 991 lower rear diffuser (504-257-99) offers several advantages, such as improved downforce, enhanced aesthetics, durability, and compatibility. However, it also comes with potential drawbacks like cost, installation complexity, and increased noise.

If you're an avid Porsche enthusiast looking to maximize the performance of your 911R, GT3, or GT3RS, the lower rear diffuser is an excellent investment. However, consider your budget, installation capabilities, and personal preferences before making the purchase. For those seeking a more affordable alternative, aftermarket options from reputable manufacturers might be worth exploring.

part # 99150425799 prices

• $45.00-$200.00

specifications performaproto:

• for models: Gt3
• for makes: Porsche
• manufacturer part number: 991-504-257-99
• country of origin: Germany

offer performaproto:

• best offers: True
• quantity: 1
• availability: In Stock
• sold: 0
• started: April 13, 2026
• options: Ship-to-home

seller performaproto:

• rating: 100.0%
• # reviews: 321

shipping performaproto:

• class: Standard
• carrier: FedEx
• cost: $82.40
• transit: 4-10 Days
• type: Calculated
• service: FedEx Ground / FedEx Home Delivery

general performaproto:

• Permance Racing Parts > Auto Permance Parts > Body Kits
• condition: Used

returns performaproto:

• policy: Returns Accepted
• paid by: Seller
• time: 30 Days

payments performaproto:

• wallet: Apple-pay
• other
• credit card: Mastercard

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