BMW 11611310786 Engine Air Intake Manifold Plenum S14B23

( Manufacturer Part Number: 11611310786 ), ( Part Type: Intake Engine Manifold )

Review BMW Engine Air Intake Manifold Plenum Used fits E30 M3

The **BMW 11611310786 E30 M3 S14 B23 Engine Air Intake Manifold Plenum** is a meticulously crafted, high-performance component designed exclusively for the legendary **BMW M3 (E30) with the S14 B23 engine**, a powerhouse renowned for its precision engineering and track-focused capabilities. This intake manifold plenum serves as the critical junction between the air filter housing and the engine s intake runners, ensuring optimal airflow while maintaining structural integrity under high-performance demands. Crafted from **high-grade aluminum alloy**, this part is not only lightweight but also engineered to withstand the extreme pressures and temperatures generated by the S14 s forced-induction setup, whether naturally aspirated or equipped with a turbocharger. The plenum features a **smooth, aerodynamic contour** that minimizes turbulence, allowing for a more efficient and unrestricted flow of air into the engine s cylinders, thereby enhancing throttle response and overall power delivery. Its precise fitment ensures a **perfect seal** with the engine bay s existing components, including the throttle body and intake runners, eliminating leaks that could compromise performance. Whether you re restoring a classic M3 to its original glory or upgrading an existing build, this OEM-spec plenum guarantees both reliability and authenticity, making it an indispensable part for enthusiasts seeking to preserve or amplify the S14 s legendary driving dynamics.

The part you re inquiring about is the **BMW E30 M3 S14 air intake manifold/plenum (B23 engine)**, specifically the **11611131078** (or similar variant). Below is a detailed breakdown of its pros and cons, followed by a conclusion and recommendation.

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### **Pros of Buying a Used/Aftermarket BMW E30 M3 S14 Air Intake Manifold/Plenum**

1. **Performance Gains**

- A high-quality aftermarket plenum (e.g., from manufacturers like **BMS, Injen, or AEM**) can improve airflow, leading to better throttle response and slight horsepower gains (typically 5 15 HP, depending on tuning). Stock plenums are often restrictive due to their design.

- Some aftermarket options include **direct-fit replacements** that maintain OEM compatibility while offering improved airflow.

2. **Cost-Effective Upgrade**

- Replacing the plenum is significantly cheaper than a full engine rebuild or swap. A used OEM part may cost **$50 $150**, while a high-quality aftermarket unit ranges from **$150 $300**.

- Avoids the need for a full intake manifold swap (which is more complex and expensive).

3. **Compatibility with Modifications**

- If you re running a **turbo, supercharger, or forced induction setup**, an aftermarket plenum can help manage airflow more efficiently than the stock unit.

- Some aftermarket plenums are designed to work with **E30 M3 engine swaps** (e.g., into a non-M3 E30) without major modifications.

4. **Easier Installation**

- Unlike a full intake manifold swap, replacing just the plenum is a **relatively straightforward job** that can be done with basic tools (no gasket removal or major disassembly required).

- Many aftermarket options come with **pre-installed gaskets** and clear installation instructions.

5. **Aesthetic Appeal (Optional)**

- Some aftermarket plenums (e.g., **carbon fiber or polished aluminum**) offer a sportier look, though this is secondary to performance benefits.

6. **Potential for Tuning Synergy**

- Pairing a plenum upgrade with a **ECU tune** (e.g., **Megatune, Haltech, or JB4**) can further optimize airflow and power output.

---

### **Cons of Buying a Used/Aftermarket BMW E30 M3 S14 Air Intake Manifold/Plenum**

1. **Quality Variability with Used Parts**

- A **used OEM plenum** may have **internal corrosion, cracks, or warping** from years of use, especially if it was removed from a car with a modified engine (e.g., turbocharged).

- Without inspection, you might unknowingly buy a **compromised part** that could lead to leaks or failure.

2. **Aftermarket Fitment Issues**

- Not all aftermarket plenums are **direct-fit** for the E30 M3 S14. Some require **modifications** (e.g., drilling, bending, or cutting) to align with the engine bay.

- **Incompatibility with certain modifications**: If you have a **non-stock exhaust or intercooler setup**, an aftermarket plenum might not integrate cleanly.

3. **Potential for Voiding Warranties**

- If your car is under warranty (unlikely for an E30, but possible with modern swaps), installing an aftermarket part could void coverage.

- Some tuners recommend **only using OEM or BMW-approved parts** for warranty purposes.

4. **Limited Power Gains Without Tuning**

- A plenum upgrade alone **won t make a huge difference** in power unless paired with a **ECU tune**. Expect modest gains unless you re running forced induction.

- If you re not tuning, the improvement may be negligible compared to the cost.

5. **Risk of Improper Installation**

- If not installed correctly, an aftermarket plenum can cause **air leaks**, **vacuum issues**, or even **engine damage** if it restricts airflow excessively.

- Some aftermarket parts require **separate intake manifold removal**, adding complexity.

6. **Depreciation of Used Parts**

- Even if a used OEM plenum is cheap, it may not last long if the engine has **high mileage or internal issues** (e.g., carbon buildup, oil leaks).

7. **Potential for Overcomplicating the Build**

- If you re on a budget, spending money on a plenum upgrade might be better directed toward **more impactful mods** (e.g., **exhaust, fueling upgrades, or a full intake manifold swap**).

---

### **Conclusion**

The **BMW E30 M3 S14 air intake manifold/plenum** is a **moderate-value upgrade** that can provide **noticeable but not drastic** performance improvements. Whether it s worth it depends on your **budget, goals, and existing modifications**:

- **If you re running a stock or mildly modified engine**, a **high-quality aftermarket plenum** (e.g., **BMS or Injen**) is a **wise investment** for better airflow and throttle response, especially if paired with a tune.

- **If you re on a tight budget**, a **used OEM plenum** (inspected for damage) is a **low-risk, low-cost option**, but prioritize **internal condition** to avoid future issues.

- **If you re planning forced induction**, a plenum upgrade is **highly recommended** to prevent airflow restrictions.

- **If you re not tuning**, the gains may be minimal, and the money could be better spent on **exhaust, fueling, or a full intake manifold swap**.

---

### **Recommendation**

- **Go aftermarket** (e.g., **BMS, Injen, or AEM**) if you want **direct-fit, high-quality airflow** and are willing to **tune the ECU** for optimal results.

- Example: **BMS 1000 Series Plenum** is a popular choice for E30 M3 builds.

- **Buy a used OEM plenum** (preferably from a **trusted seller** with inspection photos) if you re confident in its condition.

- **Check for cracks, warping, or internal corrosion** before purchasing.

- **Mandatory upgrade** stock plenums cannot handle high airflow demands without tuning.

- **Cheap no-name aftermarket parts** (risk of poor fitment or quality).

- **Uninspected used parts** (could lead to leaks or failure).

- A **ECU tune** (e.g., **Megatune, Haltech**) to fully realize airflow benefits.

- **High-flow intake filters** (e.g., **K&N, Spykar**) for further gains.

---

The **E30 M3 S14 plenum upgrade is a smart mid-tier modification** it s not a "must-have," but it s a **cost-effective way to improve airflow** if you re serious about performance. Prioritize **quality over cost** and **pair it with tuning** for the best results. If you re already running a **full intake manifold swap or forced induction**, the gains will be more noticeable.

Details:

In great shape with no issues. Bought this for a project and ended up not using it. The finish isn perfect, but is pretty good for its age. Easily spruced up if you want to powder coat it.

Just the plenum, does not include intake runners.

part #: 11611310786 prices

• $380.00-$550.00

specifications cylinderheapar:

• for models: E30, M3
• for makes: Bmw
• mpn: 11611310786
• part type: Intake Engine Manifold

seller cylinderheapar:

• # reviews: 221
• rating: 100.0%
• city: Denver, Colorado

general cylinderheapar:

• Car Truck Parts Accessories > Engines Engine Parts > Cylinder Heads
• condition: Used

offer cylinderheapar:

• quantity: 1
• options: Ship-to-home
• sold: 0
• started: March 7, 2026
• best offers: True
• availability: In Stock

shipping cylinderheapar:

• service: USPS Ground Advantage
• transit: 4-10 Days
• class: Standard
• type: Calculated
• carrier: USPS
• cost: $19.11

payments cylinderheapar:

• money order
• other
• credit card: Visa
• wallet: Apple-pay

returns cylinderheapar:

• policy: No Returns

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