PORSCHE Left Marker Light 991.631.155.02 911-BOXSTER-CAYMAN

( Manufacturer Part Number: 99163115502 ), ( Part Type: Light ), ( Ipn: 991.631.155.02 ), ( Lens Color: Amber ), ( Placement On Vehicle: Left )

Review PORSCHE Left Side Marker Light Oem

The **Porsche 991.6 911 Boxster/Cayman Left Marker Light (Part Number: 91163115502)** is a meticulously engineered component designed to elevate both the aesthetic and functional performance of your Porsche 991.6 generation sports car. Crafted with the same precision and attention to detail that defines Porsche engineering, this marker light is a seamless blend of form and function, ensuring optimal visibility while maintaining the vehicle s sleek, aggressive silhouette. The light features a robust, high-quality housing constructed from durable materials, engineered to withstand the rigors of daily driving, from urban commutes to spirited highway cruises. Its aerodynamic shape not only enhances the car s dynamic lines but also minimizes air resistance, contributing to the vehicle s already impressive efficiency and handling. The illumination is crisp and bright, utilizing advanced LED technology to provide clear, reliable visibility in low-light conditions, whether you re navigating a winding mountain road or parking in a dimly lit garage. This marker light is not merely an accessory but a critical element in Porsche s commitment to safety and performance, ensuring that every detail no matter how small is executed with the same level of excellence as the rest of the vehicle. Whether you re a purist seeking to maintain the factory look or a customizer looking to refine the car s appearance, this left marker light is a testament to Porsche s relentless pursuit of perfection, delivering both functionality and a touch of timeless elegance.

### **Pros and Cons of Buying a Porsche 991 (991.6) Boxster/Cayman with Left Marker Light (VIN: 91163115502)**

#### **Pros**

1. **Performance and Driving Experience**

The 991 generation (2015 2020) Boxster and Cayman are among Porsche s most refined and capable models. The **955 hp (Boxster S) and 980 hp (Cayman S)** engines deliver exhilarating acceleration, with the Cayman s fixed roof providing better aerodynamics and handling. The **PDK dual-clutch transmission** offers near-instantaneous gear shifts, making it one of the most engaging driving experiences in its class.

2. **Reliability and Build Quality**

Porsche s engineering has significantly improved over past generations, and the 991 series is generally more reliable than earlier models. The **9A1 engine (3.8L flat-six)** in the standard and S models is robust, with fewer known major issues compared to the 997 generation. The **PDK transmission** has also matured, with fewer reports of premature failures than in its early iterations.

3. **Aftermarket and Customization Potential**

The 991 platform is highly sought after by tuners, offering a vast array of aftermarket upgrades. From **engine tuning (e.g., MHD, JE, or custom ECU flashes)** to **suspension modifications (coilovers, lowering springs)**, owners have extensive options to enhance performance and aesthetics. The **open-top Boxster** and **fixed-roof Cayman** both benefit from aftermarket work, though the Cayman s rigidity makes it slightly more stable for aggressive modifications.

4. **Resale Value and Prestige**

Porsche models, especially the Boxster and Cayman, hold their value well due to their desirability. The **991 generation is considered a transitional model** between the 997 (older, more basic) and the upcoming 992 (more modern, tech-focused). This makes it a **good balance between affordability and prestige**, appealing to both enthusiasts and collectors.

5. **Comfort and Practicality (Compared to Earlier Models)**

While still a sports car, the 991 offers **better interior refinement** than the 997, with improved sound insulation, a more comfortable seating position, and a **more user-friendly infotainment system** (though still behind modern standards). The **Cayman s fixed roof** provides better weather protection, and both models have **larger rear seats** than the 997, making them slightly more practical for occasional passengers.

6. **Left Marker Light (LML) Modification**

The **left marker light modification** (commonly referred to as a "lefty" or "left-side marker") is a popular aesthetic choice among Porsche enthusiasts. It involves **removing the right-side marker light** and replacing it with a left-side one, giving the car a more aggressive, track-focused appearance. While not a performance modification, it is a **common and accepted customization** that does not negatively impact reliability. However, it may **reduce nighttime visibility** slightly, which could be a minor concern for some owners.

7. **Track and Performance-Oriented Features**

The **991.6 (2016 ) models** introduced **adaptive damping (PDC)** and **improved aerodynamics**, making them better suited for track use. The **Cayman GT and Boxster GT** variants are particularly well-equipped for high-performance driving, with **stiffer suspension, larger brakes, and better cooling**. The **991.2 (2015 2016) models** are slightly less refined but still capable.

---

#### **Cons**

1. **High Cost of Ownership**

Porsche parts, maintenance, and repairs are **expensive**. Routine services (e.g., **valve cover gaskets, oil changes, brake jobs**) can cost **$1,000 $3,000 ** depending on the shop. The **9A1 engine** is generally reliable, but **timing chain tensioners and water pumps** are known wear items that may require replacement. **PDK transmission fluid changes** are also costly and should be done regularly to prevent premature failure.

2. **Electrical and Infotainment Issues**

The **991 s infotainment system (Porsche Communication Management, PCM)** is **clunky and outdated** compared to modern standards. Navigation updates are **slow and expensive**, and the system can be **prone to glitches**. Some owners report **random electrical gremlins**, such as **sensor failures, dashboard warnings, or intermittent power issues**, which can be frustrating to diagnose.

3. **Rust and Corrosion Concerns**

The **991 was produced during a period when Porsche s rust prevention was inconsistent**. Some early models (especially those in **salt-heavy regions**) may develop **rust in the wheel wells, rocker panels, or subframe**. A **thorough inspection** is essential before purchase, particularly checking for **underbody corrosion** and **frame damage**.

4. **Depreciation and Market Saturation**

While the 991 holds value better than many sports cars, it is **not as future-proof as a 911**. The **992 generation (2020 present)** is more modern, with **hybrid options, improved tech, and better efficiency**, which may reduce demand for the 991 in the long term. Additionally, **supply is high** due to Porsche s shift toward newer models, which can **suppress resale values** compared to rarer or more desirable models.

5. **Open-Top Limitations (Boxster Only)**

The **Boxster s convertible top** is **not as weatherproof as the Cayman s fixed roof**. Wind noise at high speeds, **leaks during rain**, and **top mechanism wear** (especially in older models) can be nuisances. While the **991 s top is an improvement over the 997**, it is still **not as reliable as a modern convertible** (e.g., a 911 Cabriolet).

6. **Left Marker Light Modification Risks**

While the **left marker light modification is common**, it is **not factory-approved** and may **void certain warranties** (if applicable). Some insurance companies may **question its legality** in certain regions, though it is **not illegal in most places**. The **primary concern is reduced nighttime visibility**, which could be a safety issue in low-light conditions. Additionally, **aftermarket LML kits may not fit perfectly**, leading to **poor integration or potential damage** if not installed correctly.

7. **Limited Modern Tech and Connectivity**

The **991 lacks Bluetooth connectivity, Apple CarPlay, or Android Auto**, which can be inconvenient in today s smartphone-dependent world. **Wireless charging, advanced driver aids (ADAS), and modern connectivity features** are absent, making it feel **outdated compared to newer Porsche models**.

8. **Potential Transmission Issues (PDK)**

While the **PDK transmission is generally reliable**, **early models (pre-2016) had more reports of failures** due to **poor fluid specifications or neglect**. Later models improved, but **regular PDK fluid changes (every 30,000 50,000 miles)** are **critical** to prevent costly failures. Some owners have reported **clutch wear, delayed shifts, or complete PDK failure**, which can be **extremely expensive to repair**.

9. **Suspension and Handling Wear**

The **991 s adaptive damping (PDC) system** can **degrade over time**, leading to **softer, less responsive handling**. The **suspension bushings and struts** may also wear out, requiring **replacement every 60,000 100,000 miles**. **Wheel alignment issues** are common due to **road damage or improper handling**, which can lead to **uneven tire wear**.

10. **Fuel Economy and Hybrid Concerns**

The **991 s 9A1 engine is thirsty**, with **fuel economy around 15 18 MPG in the Boxster and 16 20 MPG in the Cayman**. While not terrible for a sports car, it is **less efficient than modern hybrids (e.g., 911 Turbo S Hybrid)**. If fuel costs are a concern, this could add up over time.

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### **Conclusion**

The **Porsche 991 Boxster/Cayman (VIN: 91163115502) with a left marker light modification** is an **excellent choice for enthusiasts** who prioritize **driving dynamics, performance, and customization potential**. It offers a **strong balance between modern refinement and classic Porsche character**, making it ideal for **track days, spirited driving, and aftermarket tuning**.

However, **high ownership costs, potential reliability issues (especially with the PDK and electrical systems), and depreciation risks** must be carefully considered. The **left marker light modification is a cosmetic upgrade** that enhances the car s appearance but does not impact performance though it may slightly reduce nighttime visibility.

### **Recommendation**

- You are an **enthusiast who values driving dynamics** and enjoys

Details:

Has very minor scuffs which are not noticeable unless inspecting close see last picture, Fits 911, Boxster, Cayman for years 2012, 2013, 2014, 2015, and 2016. Good working condition. Left hand / Driver Side Marker light. This is an OEM part from a Porsche Boxster.

part #: 99163115502 prices

• $49.49-$125.00

specifications sidemarkeligh:

• for makes: Porsche
• mpn: 99163115502
• part type: Light
• ipn: 991.631.155.02
• lens color: Amber
• placement on vehicle: Left

shipping sidemarkeligh:

• transit: 5-12 Days
• service: USPS Ground Advantage
• class: Standard
• cost: $5.45
• carrier: USPS
• type: Calculated

returns sidemarkeligh:

• policy: No Returns

payments sidemarkeligh:

• other
• credit card: Discover
• wallet: Google-pay

seller sidemarkeligh:

• # reviews: 263
• city: Boise, Idaho
• rating: 100.0%

offer sidemarkeligh:

• options: Ship-to-home
• started: February 6, 2026
• availability: In Stock
• quantity: 1
• sold: 0

general sidemarkeligh:

• condition: Used
• Car Truck Parts Accessories > Lighting Lamps > Side Marker Light Assemblies

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