# **Does the E90 BMW 3-Series Include a Sway Bar? Comprehensive Overview**
The BMW E90 3-Series, produced between 2005 and 2013, stands out as a favored luxury sports sedan recognized for its outstanding handling and driving characteristics. A crucial element that enhances its stability and cornering abilities is the **sway bar** (also referred to as an anti-roll bar or stabilizer bar).
If you’re curious whether the E90 3-Series includes a sway bar, the brief answer is **yes**—all E90 variants are factory-equipped with sway bars. However, the dimensions and rigidity of these bars differ based on the particular model and trim. In this overview, we’ll delve into the function of sway bars, their specifications across various E90 models, and potential upgrade paths.
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## **What Is a Sway Bar and Its Function?**
A **sway bar** is a part of the suspension system meant to minimize body roll while the vehicle performs turns. It links the left and right sides of the suspension, aiding in weight distribution and enhancing stability and handling.
### **Main Advantages of a Sway Bar:**
– **Minimizes body roll** during turns
– **Boosts cornering stability** and grip
– **Improves steering feedback**
– **Ensures a more level ride** by maintaining vehicle balance
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## **Does the E90 3-Series Feature a Sway Bar?**
Indeed, every BMW E90 3-Series model is equipped with both **front and rear sway bars** from the factory. Nevertheless, the diameter and rigidity of these bars can differ based on the model, trim level, and whether the vehicle includes a sport suspension.
### **Factory Sway Bar Dimensions by Model**
| **Model** | **Front Sway Bar Diameter** | **Rear Sway Bar Diameter** |
|———–|—————————-|—————————-|
| **E90 325i/328i (Base Suspension)** | ~26.5mm | ~13mm |
| **E90 325i/328i (Sport Suspension)** | ~26.5mm | ~15mm |
| **E90 330i** | ~26.5mm | ~15mm |
| **E90 335i (Base Suspension)** | ~26.5mm | ~13mm |
| **E90 335i (Sport Suspension)** | ~26.5mm | ~15mm |
| **E90 M3** | ~28mm | ~23mm |
The **M3 model** boasts the thickest and most rigid sway bars, which enhance its exceptional handling attributes.
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## **Enhancing the Sway Bars on an E90 3-Series**
While the factory sway bars offer satisfactory handling, many enthusiasts opt for upgrades to achieve **enhanced cornering performance and reduced body roll**. Below are some popular upgrade choices:
### **1. M3 Sway Bar Upgrade**
– The **E90 M3 sway bars** are a favored enhancement for non-M E90 models.
– They are thicker and more rigid, delivering superior handling while keeping the ride comfortable.
– These bars are typically a direct bolt-on for most E90 models but might necessitate new bushings.
### **2. Aftermarket Performance Sway Bars**
– Manufacturers like **H&R, Eibach, and Hotchkis** provide upgraded sway bars with adjustable rigidity.
– Such bars allow for customizing handling traits.
– Perfect for track enthusiasts or spirited driving adventures.
### **3. Adjustable End Links**
– Upgrading to **adjustable sway bar end links** can help mitigate preload and enhance suspension flexibility.
– Recommended when lowering the vehicle or adding stiffer sway bars.
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## **Identifying When Your Sway Bar Requires Replacement**
Over time, sway bar components may become worn, leading to diminished handling and unwanted noises. Here are some indicators that your sway bar or its bushings might need replacement:
– **Clunking or banging sounds** when traversing bumps
– **Excessive body roll** in turns
– **Loose or unstable steering sensation**
– **Noticeable wear or fissures** in the sway bar bushings
If you notice any of these signs, it’s advisable to examine your sway bar and bushings for signs of wear and consider replacing them.
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## **Summary**
The **E90 BMW 3-Series does feature a sway bar** directly from the factory, with thickness variations according to the model and suspension configuration. While the original sway bars deliver adequate handling, switching to **M3 sway bars or aftermarket performance alternatives** can significantly improve cornering capability and minimize body roll.
Whether you’re aiming to enhance your day-to-day driving experience or get your E90 ready for track action, upgrading the sway bars is a valuable modification. If you’re encountering handling problems, checking and replacing degraded sway bar components can help restore your vehicle’s stability and responsiveness.
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