BMW 6870691 Rear Sway Stabilizer Bar

( Manufacturer Part Number: 6870691 ), ( Type: Sway Bar ), ( Placement On Vehicle: Rear ), ( Color: Black ), ( Country Of Origin: Germany ), ( Performance Part: No ), ( Tag : 4356 )

Review BMW Sedan Rear Sway Stabilizer Bar Oem fits 330I G20 2019–2026

The **BMW 330i (G20) Rear Sway Stabilizer Bar (Part Number: 6870691, Fits Models: 2019 2026)** is a precision-engineered suspension component designed to enhance the handling dynamics and stability of BMW s fifth-generation 3 Series, particularly in the sporty 330i variant. This high-performance stabilizer bar is a critical element of the vehicle s rear suspension system, working in tandem with the shocks, springs, and control arms to minimize body roll during aggressive cornering, sharp lane changes, or high-speed maneuvers. Crafted from durable, high-grade steel, the stabilizer bar is built to withstand the rigors of spirited driving while maintaining structural integrity under repeated stress, ensuring consistent performance over thousands of miles. Its robust construction also contributes to a more composed ride by reducing unwanted lateral movement, which is especially beneficial for drivers who prioritize both comfort and precision. The G20 platform s rear-wheel-drive architecture relies heavily on a well-tuned stabilizer bar to optimize power delivery and traction, making this part an essential upgrade for enthusiasts looking to refine their 330i s cornering behavior or replace a worn-out original component. Whether installed as part of a full suspension refresh or as a standalone performance enhancement, this stabilizer bar delivers a measurable improvement in stability, responsiveness, and overall driving engagement, making it a sought-after choice for BMW owners seeking to push the boundaries of their vehicle s capabilities.

### **Pros and Cons of Buying a BMW 330i (G20, 2019 2026) with a Rear Sway Stabilizer Bar (Part Number 6870691)**

#### **Pros of Installing the Rear Sway Stabilizer Bar (6870691)**

1. **Improved Handling and Stability**

The G20 330i is a rear-wheel-drive car with a naturally understeer-prone chassis, especially when loaded or driven aggressively. A rear sway bar helps counteract body roll during cornering, making the car feel more planted and responsive. This is particularly noticeable in high-speed curves or when carrying passengers or cargo.

2. **Better Weight Distribution**

The stock G20 330i has a relatively soft rear suspension setup, which can lead to excessive body roll. Adding a stiffer rear sway bar redistributes weight more effectively, reducing lean and improving traction. This is especially useful for drivers who push the car harder or prefer a more engaged driving experience.

3. **Enhanced Performance in Drifting or Oversteer Situations**

While the G20 is not a drift-focused platform, a rear sway bar can help manage oversteer by preventing excessive rear-end movement. This is useful for those who occasionally engage in controlled drifting or want a more predictable handling character.

4. **Compatibility with Other Suspension Upgrades**

If you plan to modify the suspension (e.g., lowering springs, stiffer shocks, or sway bar links), the 6870691 is a direct replacement and can be easily integrated into a more aggressive setup. It s also compatible with aftermarket sway bar links if you want to adjust the bar s effectiveness.

5. **Stock BMW Part**

Since this is an OEM BMW part, it is high-quality and designed to work seamlessly with the G20 s suspension geometry. It avoids the potential fitment issues that can arise with aftermarket parts that may not match the factory mounting points perfectly.

6. **Cost-Effective Upgrade**

Compared to full suspension overhauls or more aggressive performance parts, the rear sway bar is a relatively inexpensive upgrade that delivers noticeable improvements in handling. Pricing typically ranges between **$300 $600**, depending on whether you buy new or used.

7. **Maintains BMW s Intended Chassis Feel**

Unlike overly stiff aftermarket sway bars that can make a car feel harsh or unrefined, the 6870691 provides a balanced upgrade that enhances handling without sacrificing comfort. It keeps the car s sporty yet civilized character intact.

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#### **Cons of Installing the Rear Sway Stabilizer Bar (6870691)**

1. **Minimal Impact on Lightly Loaded or Casual Driving**

If you primarily drive the 330i on highways or in light traffic without aggressive cornering, the difference may be subtle. The G20 is already a well-balanced car, and the sway bar s effect is most noticeable at higher speeds or when loaded.

2. **Potential for Over-Steer Sensitivity in Extreme Conditions**

While the sway bar helps with understeer, it can make the car slightly more prone to oversteer in very aggressive driving (e.g., hard braking into corners or rapid throttle inputs). Some drivers may find this less forgiving than the stock setup.

3. **Installation Requires Basic Mechanical Skill**

Installing the sway bar is not extremely difficult, but it does require removing the rear subframe (or accessing the sway bar mounts from below). This may involve jacking up the car, removing the rear bumper, and possibly adjusting sway bar links. If you re not comfortable with suspension work, you may need to pay a mechanic, adding to the cost.

4. **Compatibility with Aftermarket Suspension Mods**

If you ve already installed aftermarket suspension components (e.g., coilovers, lower springs, or different sway bar links), the stock 6870691 may not be the optimal choice. You might need to pair it with a stiffer or different-sized bar to match your setup.

5. **No Major Performance Gains for Track Use**

While the sway bar improves road handling, it is not a track-focused upgrade. For serious track use, you d likely need additional modifications like stiffer springs, adjustable sway bar links, or a full suspension tune.

6. **Potential for Increased Wear on Other Components**

A stiffer rear sway bar can increase stress on the rear subframe mounts, bushings, and even the driveshaft. Over time, this could lead to premature wear if the rest of the suspension isn t properly maintained.

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### **Conclusion**

The **BMW 6870691 rear sway stabilizer bar** is a worthwhile upgrade for owners of the **G20 330i** who want to enhance handling, reduce body roll, and improve stability especially in loaded or performance-oriented driving scenarios. It strikes a good balance between cost, effectiveness, and compatibility with the stock chassis.

That said, it is not a "magic fix" for all handling issues, and its benefits are most noticeable under specific conditions (high-speed cornering, aggressive driving, or when carrying weight). If you re already running aftermarket suspension parts, you may need to pair this with additional modifications for optimal results.

For **casual drivers** who mostly use the car for daily commuting or highway driving, the upgrade may not feel as significant. However, for **enthusiasts** who enjoy a more engaged and stable driving experience, it is a practical and affordable choice.

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### **Recommendation**

- You want to improve the 330i s handling without a full suspension overhaul.

- You frequently drive at higher speeds or with the car loaded.

- You plan to pair it with other suspension upgrades (e.g., stiffer shocks, sway bar links).

- You prefer a more planted and responsive feel, especially in curves.

- You re on a tight budget and only want minor handling tweaks.

- You ve already installed aggressive aftermarket suspension parts that may conflict with the stock sway bar.

- You primarily drive the car in city or low-speed conditions where the difference is negligible.

The **6870691 rear sway stabilizer bar** is a **solid, cost-effective upgrade** for the G20 330i, offering noticeable improvements in stability and cornering feel. It s one of the easier suspension modifications to install and maintains BMW s intended chassis character. If you re looking to enhance the car s performance without a major overhaul, this is a recommended addition.

Details:

Sheet metal parts are warranted only against factory corrosion under normal use. Priced right, shipped timely. Locations without a dock or forklift require lift gate service, which must be disclosed at time of purchase. Shipping cost was normal and the item well packaged.

Shipping was pricey, but you gotta do what. If damage occurs during shipping, buyers must provide sufficient documentation to support a carrier claim. Warranty This part includes a 3-Months Limited from the date of purchase. Wide Range of Parts.

Tag Number 4356, Year/Year Range 2019 -2026, Make BMW, model 330I, Sub model, Series G20. Body Type Sedan. Some panels in worse shape than others but overall got what I expected, as described. All parts are tested and inspected for reliability performance.

Airbags and SRS components are sold AS IS with no warranty. Part Number 6870691. Fast Reliable. I was able to fix them with parts off my old panels.

The item was as described and value great. Overall very satisfied. They look great in the car. 10 out of would recommend.

Didn't budge on the pallet and was waterproof. This is the sole and exclusive warranty provided for this part. Quality Assurance. Well packaged to prevent damage even though it looks like the shipper tried.

part #: 6870691 prices

• $119.99-$129.99

specifications swabasus:

• for models: 330i, G20
• for makes: Bmw
• for years: 2019-2026
• mpn: 6870691
• type: Sway Bar
• placement on vehicle: Rear
• color: Black
• country of origin: Germany
• performance part: No
• tag : 4356

offer swabasus:

• sold: 0
• options: Ship-to-home
• availability: In Stock
• best offers: True
• started: May 26, 2026
• quantity: 1

seller swabasus:

• rating: 100.0%
• city: Rancho Cordova, California
• # reviews: 560

payments swabasus:

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

shipping swabasus:

• class: Economy
• carrier: FedEx
• transit: 3-9 Days
• service: FedEx Ground Economy
• cost: $60.00
• type: Fixed

general swabasus:

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

returns swabasus:

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

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