SUBARU 57707FL21A Corner

( Manufacturer Part Number: 57707FL21A ), ( Genuine Oem: Yes ), ( Warranty: 1 Year ), ( Fitment Type: Direct Replacement ), ( Year: 2017 2018 2019 2020 2021 2022 2023 ), ( Parts Included: Only Part Reference 11 On The Diagram Is Included )

Review SUBARU Genuine Corner Support fits IMPREZA 2017–2023

The **Subaru 57707FL21A Corner** is a high-performance, precision-engineered suspension component designed to elevate the handling dynamics and ride comfort of Subaru vehicles equipped with the standard or optional Multi-Link Rear Suspension (MLRS) system. This corner link, part of Subaru s proprietary rear suspension architecture, plays a critical role in maintaining optimal wheel alignment, load distribution, and articulation under varying driving conditions. Crafted from high-strength, heat-treated steel, this component is forged to exacting tolerances to ensure durability and resistance to fatigue, even during aggressive driving, off-road excursions, or repeated high-load scenarios such as towing or heavy cargo transport. The **57707FL21A** features a robust, bolted design with reinforced attachment points, including a spherical bearing at the wheel end to facilitate smooth pivoting motion while minimizing friction and wear. This design allows the rear wheels to track true and respond predictably to steering inputs, reducing body roll and enhancing stability during cornering, particularly in vehicles like the WRX, STI, or Outback with optional MLRS. Whether navigating tight urban streets, winding mountain roads, or rough off-road trails, this corner link contributes to a balanced suspension geometry that minimizes camber changes and promotes consistent tire contact with the road surface. Subaru s engineering of this part ensures compatibility with the factory suspension bushings and dampers, making it an ideal upgrade for enthusiasts seeking to restore factory performance or enhance the longevity of their suspension system. For those pursuing a more aggressive setup, pairing this corner link with upgraded bushings or coilovers can further refine the vehicle s responsiveness and handling characteristics, making it a versatile and reliable choice for both daily driving and performance applications.

### Pros and Cons of Buying a Subaru 57707FL21A Corner (2021 Outback with 57707FL21A Engine Code)

#### **Overview**

The **Subaru 57707FL21A** engine code corresponds to the **2.5L naturally aspirated boxer-four (EJ257) engine** found in the **2021 Subaru Outback (and some Legacy models)**. This engine is part of the **EJ-series**, which has been refined over generations. Below is a detailed breakdown of its advantages and drawbacks.

---

### **Pros**

1. **Proven Reliability**

The EJ257 engine, while not as modern as turbocharged Subaru engines, has a strong reputation for longevity when properly maintained. Many owners report **200,000 miles** with basic upkeep, especially if the **timing belt, water pump, and other critical components** are replaced at manufacturer-recommended intervals.

2. **Simplicity and Durability**

Unlike turbocharged engines, the **naturally aspirated EJ257 lacks forced induction**, reducing stress on internal components. This makes it **less prone to turbo-related failures** (e.g., turbocharger wear, oil leaks). The **boxer configuration** also contributes to a **low center of gravity**, improving handling and stability.

3. **Fuel Efficiency**

- **City:** 18 20 MPG

- **Highway:** 26 28 MPG

This is competitive with many turbocharged rivals, especially when considering the lack of turbo lag or potential turbo failures.

4. **Lower Maintenance Costs**

Without turbochargers, intercoolers, or complex exhaust systems, **maintenance is simpler and cheaper**. Common issues like **turbo failure, wastegate leaks, or boost controller problems** (seen in turbocharged Subarus) are absent. Basic maintenance (oil changes, spark plugs, timing belt) remains straightforward.

5. **AWD Standard**

The Outback comes **standard with Subaru s Symmetrical AWD**, which is highly capable in snow, mud, and off-road conditions. This is a major advantage in regions with harsh winters or rough terrain.

6. **Resale Value**

Naturally aspirated Subarus (especially older EJ models) tend to **hold value better than turbocharged counterparts** due to lower repair risks. The 2021 Outback with this engine is still a **practical, no-frills SUV** that appeals to buyers who prioritize reliability over performance.

7. **Quiet and Smooth Operation**

The **boxer engine** is known for its **smooth power delivery** and **low vibration**, contributing to a **comfortable ride**. Many drivers appreciate the **lack of turbo whine or aggressive turbo spool-up** found in forced-induction engines.

8. **Off-Road Capability**

The Outback s **ground clearance, approach/departure angles, and AWD** make it a **capable overland or light off-road vehicle**. While not a true truck, it can handle **gravel roads, light trails, and snow** without major modifications.

9. **No Carbon Buildup Issues**

Turbocharged engines often suffer from **carbon buildup** due to direct injection, leading to misfires and reduced performance. The **port-injected EJ257 avoids this issue**, making it more reliable over time.

10. **Lower Risk of Turbo-Related Problems**

Turbocharged Subarus (e.g., 2.4L FB24, 2.0L FB20) are prone to **turbo failure, oil leaks, and wastegate issues**, especially in high-mileage examples. The **NA EJ257 eliminates these concerns**, making it a **more predictable choice** for long-term ownership.

---

### **Cons**

1. **Lower Power Output**

The **2.5L NA engine produces only 170 180 hp and 175 185 lb-ft of torque**, which is **significantly less** than modern turbocharged Subarus (e.g., 2.4L FB24 with 260 hp). This means **slower acceleration**, especially when towing or passing on highways.

2. **Outdated Technology**

The **EJ257 is a 2000s-era engine** with **no direct fuel injection** (port injection only), which can lead to **less efficient combustion and slightly higher emissions** compared to modern turbocharged engines. While this doesn t affect daily driving much, it does mean **less power and slightly worse fuel economy** than newer Subarus.

3. **Higher Idle and Revving**

The **boxer engine revs noticeably higher** than turbocharged rivals, which some drivers find **annoying or loud** in stop-and-go traffic. The **idle can also feel a bit rough** compared to smoother turbo engines.

4. **Limited Modern Features**

The 2021 Outback with this engine lacks **some advanced driver aids** found in newer models (e.g., **standard adaptive cruise control, advanced collision mitigation**) unless upgraded. However, **standard safety features like EyeSight (adaptive cruise, pre-collision braking) are included**.

5. **Potential for Timing Belt Failure**

While rare if maintained, **timing belt failure in an interference engine can cause catastrophic damage** (bent valves). The **EJ257 is an interference engine**, so **strictly following the timing belt replacement interval (every 105,000 miles or 10 years) is critical**.

6. **Less Power for Towing**

If you plan to **tow a trailer or carry heavy loads**, the **limited power and torque** of the NA engine may require **more frequent gear changes** or **lower speeds**. Subaru s towing capacity for the Outback is ** 3,500 lbs**, but the engine may struggle at higher weights.

7. **Higher Maintenance Than Some Modern Engines**

- **Water pump replacement** (often tied to timing belt service)

- **Spark plugs** (every 60,000 100,000 miles)

- **Cooling system flushes** (every 5 years or 60,000 miles)

- **Valve adjustment** (if not using hydraulic lifters, though the EJ257 has them)

8. **Less Refined Ride Than Turbo Models**

Some drivers prefer the **smoother, more linear power delivery** of turbocharged engines. The **NA EJ257 can feel a bit "peppy" but not as smooth** as a turbo engine with electronic boost control.

9. **Limited Aftermarket Support**

While not a dealbreaker, **turbocharged Subarus have a larger aftermarket presence** for performance parts (e.g., turbo upgrades, exhaust systems). The **NA EJ257 has fewer tuning options**, though it can be **forcibly induced** (though this voids warranty and risks engine damage).

10. **Higher Mileage Concerns**

- **Timing belt/water pump service**

- **Spark plug replacements**

- **Cooling system health**

- **No signs of oil leaks or coolant contamination**

---

### **Conclusion**

The **2021 Subaru Outback with the 57707FL21A (2.5L NA EJ257) engine** is a **practical, reliable, and low-maintenance choice** for buyers who prioritize **durability, simplicity, and fuel efficiency** over raw power. It is **ideal for:**

- **Everyday commuting and family use**

- **Drivers in snowy or rural areas (thanks to AWD)**

- **Those who want a no-nonsense, long-lasting SUV**

- **Buyers who dislike turbocharged engines and their potential issues**

However, if you **need more power, better fuel economy, or modern tech features**, a **turbocharged Subaru (e.g., 2022 Outback with FB24 engine) or a non-Subaru competitor (e.g., Honda CR-V, Toyota RAV4 Hybrid)** may be a better fit.

---

### **Recommendation**

You want a **reliable, low-maintenance SUV** with **AWD standard**.

You **don t need excessive power** and are okay with **slower acceleration**.

You **prefer simplicity over turbocharged complexity**.

You **plan to keep it for 200,000 miles** with proper maintenance.

You **live in an area with harsh winters or rough roads** where AWD is valuable.

You **need strong towing or hauling capacity**.

You **prioritize

Details:

Shipping Carrier substitutions may be made at our determination in an attempt to reduce shipping cost the customer. Parts must be resalable and in the original packaging. Electrical parts are not returnable.

part #: 57707fl21a prices

• $30.54-$57.80

specifications vintagecarbumperus:

• for models: Impreza
• for makes: Subaru
• for years: 2017-2023
• mpn: 57707fl21a
• genuine oem: Yes
• warranty: 1 Year
• fitment type: Direct Replacement
• year: 2017 2018 2019 2020 2021 2022 2023
• parts included: Only Part Reference 11 On The Diagram Is Included

payments vintagecarbumperus:

• wallet: Paypal
• other
• credit card: Diners-club

returns vintagecarbumperus:

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

general vintagecarbumperus:

• condition: New
• Exterior Parts Accessories > Bumpers Components > Bumper Inserts Covers

shipping vintagecarbumperus:

• class: Standard, Expedited
• cost: $0.00
• service: Standard, Expedited
• transit: 3-7 Days
• type: Fixed

offer vintagecarbumperus:

• options: Ship-to-home
• availability: In Stock
• sold: 0
• started: March 31, 2026
• quantity: 1

seller vintagecarbumperus:

• rating: 100.0%
• # reviews: 741
• city: Shrewsbury, Massachusetts

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