BMW 31356770439 Dohc Front Stabilizer Sway Bar 3.0L L6 24V N55

( Manufacturer Part Number: 31356770439 ), ( Color: Black ), ( Material: Steel ), ( Vintage Part: No ), ( Placement On Vehicle: Front ), ( Type: Sway Bar ), ( Oe/oem Part Number: 31356793312, 31356770439, 237810-10 ), ( Manufacturer Warranty: 1 Month ), ( Features: Easy To Replace ), ( Country Of Origin: United States )

Review BMW Series 3.0l L6 Dohc 24v N55 Front Stabilizer Sway Bar Oem fits 335I E90 2011–2015

The **BMW 31356770439 OEM Front Stabilizer Sway Bar** is a precision-engineered suspension component designed exclusively for the **E90 335i (2011 2015)** models featuring the **3.0L L6 DOHC 24-valve N55 inline-six engine**. This high-performance sway bar is a direct factory replacement, ensuring seamless integration with the vehicle s suspension geometry and load-bearing requirements. Crafted from durable **chromoly steel**, the sway bar is heat-treated to achieve an optimal balance of strength and flexibility, delivering both stability and responsive handling under varying driving conditions. Its **smooth, polished finish** not only enhances aesthetic appeal but also prevents corrosion, ensuring longevity even in challenging environments. The **precisely machined ends** feature a **spherical bearing design**, allowing for smooth articulation while maintaining consistent alignment, which is critical for maintaining optimal tire contact and reducing body roll during aggressive cornering. Whether navigating tight urban streets or pushing the limits on winding roads, this sway bar contributes to a more composed and controlled driving experience, reinforcing the **335i s reputation for sport-tuned dynamics**. As an **OEM part**, it guarantees a perfect fit without the need for modifications, making it an ideal choice for both restoration projects and routine maintenance. Its robust construction and reliable performance make it a must-have component for enthusiasts seeking to preserve or enhance the E90 s legendary balance of comfort and precision.

### **Pros and Cons of Buying a BMW 335i (E90, 2011-2015, N55 3.0L Twin-Turbo L6)**

#### **Pros**

**1. Performance and Driving Dynamics**

The N55 engine is a refined twin-turbo inline-six that delivers strong performance around **300 320 hp** and **300 320 lb-ft of torque**, depending on tuning and maintenance. The E90 335i is one of the most balanced BMWs of its era, with precise handling, a well-tuned suspension (especially in Sport or M Sport trim), and engaging driving dynamics. The N55 s turbo lag is manageable, and with proper tuning, it can be even more responsive.

**2. Reliability (With Proper Maintenance)**

BMW s N55 engine is generally reliable if maintained correctly. Key components like turbos, injectors, and the oil system (especially the oil cooler and oil pump) should be checked regularly. Many N55s last well beyond 100,000 miles with attentive care. The E90 platform itself is sturdy, and the 335i is less prone to major issues compared to earlier E90 models (e.g., E46).

**3. Tuning Potential**

The N55 is one of the most tuner-friendly BMW engines ever made. Aftermarket support is extensive, with options ranging from **Stage 1 (350 400 hp)** to **Stage 2 (500 hp)** with upgraded turbos, intercoolers, and supporting mods. This makes it a great choice for enthusiasts who want to push performance without a full rebuild.

**4. Comfort and Practicality**

The E90 335i offers a comfortable ride, especially in Touring or Comfort trim, with good interior space for a coupe. The rear seats are usable (though tight), and the trunk provides decent cargo room. The interior is well-built, with high-quality materials in higher trims.

**5. Resale Value (Compared to Other BMWs)**

While not as high as newer BMWs, the E90 335i holds its value better than some older BMWs (e.g., E46 330i) due to its popularity and strong performance reputation. A well-maintained example can still fetch a decent price in the used market.

**6. Aftermarket and Modding Community**

The E90 335i has a large and active modding community. Parts like suspension upgrades (coilovers, sway bars), exhaust systems, and interior mods are widely available. This makes customization relatively straightforward.

**7. Classic BMW Feel with Modern Tech**

The E90 retains the classic BMW driving experience steering feel, gearshift, and engine sound while incorporating modern features like **iDrive (if updated), Bluetooth, and available navigation**. The M Sport package adds sport-tuned suspension and a sportier exhaust note.

---

#### **Cons**

**1. Common N55 Issues (If Neglected)**

- **Oil System:** The oil cooler and oil pump can fail, leading to oil starvation and engine damage. Some owners report oil leaks from the oil cooler lines.

- **Turbocharger Reliability:** The stock turbos (especially the low-pressure turbo) can wear out over time, requiring replacement (commonly around **100,000 150,000 miles**).

- **Injectors:** Some N55s develop injector issues (spitting, clogging), which can lead to rough idling or misfires. Replacing injectors is expensive ( $1,000 $1,500).

- **Valvetronic Motor:** The variable valve timing motor can fail, causing rough idle or stalling. Replacement is costly ( $1,000 ).

- **Carbon Buildup:** The N55 is prone to carbon deposits on intake valves, which can reduce performance. A professional intake valve cleaning is recommended every **50,000 70,000 miles**.

**2. Higher Maintenance Costs**

BMW parts and labor are expensive, especially for specialized components like turbos, injectors, and suspension parts. Regular maintenance (oil changes, timing belt, etc.) adds up over time.

**3. Suspension Wear**

The E90 s suspension is not as durable as later BMWs (e.g., F30). Bushings, struts, and control arms can wear out, leading to clunks and poor handling. A full suspension refresh is often needed after **80,000 120,000 miles**.

**4. Electrical Gremlins**

- **Faulty sensors** (e.g., MAF, crankshaft position sensor).

- **iDrive glitches** (especially in older models without updates).

- **Window regulators or door locks** failing over time.

**5. Fuel Economy (Compared to Naturally Aspirated Alternatives)**

The N55 is not the most efficient engine. In real-world driving, expect **18 22 MPG city / 25 30 MPG highway**, which is worse than a naturally aspirated 330i (though the 330i is less fun to drive).

**6. Depreciation**

While the E90 335i holds value better than some BMWs, it still depreciates significantly. A new E90 335i in 2011 cost around **$45,000 $55,000**, but today, a well-maintained example will likely sell for **$10,000 $20,000**, depending on condition and mileage.

**7. Limited Rear Visibility**

The coupe body style means less rear visibility compared to a sedan or wagon. Parking and reversing can be more challenging.

---

### **Conclusion**

The **BMW E90 335i (2011 2015, N55)** is a fantastic choice for enthusiasts who want a **balanced, fun-to-drive BMW with strong tuning potential**. It offers **great handling, a capable engine, and a comfortable ride**, making it ideal for daily driving and track use. However, it requires **attentive maintenance** to avoid costly repairs, particularly around the **oil system, turbos, and injectors**.

If you re looking for a **project car** or a **daily driver** that you can modify and enjoy for years, the N55 is an excellent pick **as long as you re prepared for maintenance costs**. If you want something **more reliable with lower long-term expenses**, a **naturally aspirated 330i or a later turbocharged model (F30 330i)** might be better.

---

### **Recommendation**

You re an enthusiast who enjoys tuning and modifying your car.

You re willing to **budget for maintenance** (oil changes, turbo upgrades, suspension refreshes).

You prefer a **coupe body style** with strong performance.

You find a **well-documented example** with **service records** (especially oil changes, turbo checks, and injector maintenance).

You want a **low-maintenance, plug-and-chug** daily driver.

You re not comfortable with **higher repair costs** (BMW parts are expensive).

You prioritize **fuel efficiency** over performance.

The car has **no service history** or signs of **neglect** (oil leaks, rough idle, turbo lag).

- **Get a pre-purchase inspection (PPI)** from a BMW specialist.

- Oil system integrity (oil cooler, pump, lines).

- Turbo condition (listen for whine, check for leaks).

- Injector health (no spitting, smooth idle).

- Suspension and bushings (no clunks, proper alignment).

- **Consider a Stage 1 tune** if you want to improve performance without major mods.

- **Budget for future maintenance** this is not a "set it and forget it" car.

The **E90 335i N55 is one of the best BMWs of its era for enthusiasts**, but it demands **responsible ownership**. If you re prepared for that, it s a **fantastic car** one of the last truly fun BMW coupes before the shift to sedans and SUVs. If you re not, a **330i or a later model with a more reliable engine** might be a smarter long-term choice.

Details:

DONOR VEHICLE 2011 BMW 3 SERIES RWD SEDAN. Buyer pays for all return shipping costs. Local pick-up is available if prior arrangements are made.

part #: 31356770439 prices

• $69.00-$141.80

specifications swabasus:

• for models: 335i, E90
• for makes: Bmw
• for years: 2011-2015
• mpn: 31356770439
• color: Black
• material: Steel
• vintage part: No
• placement on vehicle: Front
• type: Sway Bar
• oe/oem part number: 31356793312, 31356770439, 237810-10
• manufacturer warranty: 1 Month
• features: Easy To Replace
• country of origin: United States

seller swabasus:

• # reviews: 128
• city: Dallas, Texas
• rating: 100.0%

offer swabasus:

• availability: In Stock
• options: Ship-to-home
• started: June 9, 2026
• quantity: 1
• sold: 0

shipping swabasus:

• type: Fixed
• class: Standard
• transit: 4-11 Days
• service: Standard
• cost: $30.00

returns swabasus:

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

payments swabasus:

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

general swabasus:

• condition: Used
• Car Truck Parts Accessories > Steering Suspension > Sway Bars, Links Bushings

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