1. Exhaust & Emission Parts To Buy
  2. sku: 20777227208808772
  3. BMW 333.BM1N12

BMW 333.BM1N12 Rear Muffler 4.0L

fits make: Bmw. year: 2008–2013.

333.bm1n12 Bmw 08-13 M3 4.0l Rear Muffler Assembly 7840575

( Part Type: Muffler ), ( Conditions Options: Rear Muffler Scratches Scrap ), ( Genuine Oem: Yes ), ( Ipn: 333.bm1n12 ), ( Year: 2012 ), ( Descriptionpartcondition: 08-13 Bmw M3 4.0l Rear Muffler Assembly 7840575 ), ( Manufacturer Warranty: 60 Day )

Review BMW 4.0l Rear Muffler Assembly fits M3 2008–2013

The **BMW 333.BM1N12 (08-13 M3 4.0L Rear Muffler)** is a meticulously engineered aftermarket exhaust component designed to elevate the performance, aesthetics, and sonic character of BMW s legendary 4.0L S54 N54 twin-turbo inline-six engine in the E90/E92/E93 M3. Crafted from high-grade stainless steel, this muffler is built to withstand the intense heat and pressure generated by the M3 s aggressive exhaust system while delivering a bold, aggressive exhaust note that enhances the car s sporty identity. The design features a **flow-optimized internal baffling system**, ensuring a balanced exhaust tone that retains the M3 s signature growl without sacrificing power or efficiency. Unlike generic aftermarket parts, this muffler is specifically tuned to complement the stock or upgraded exhaust headers, providing a seamless integration that maximizes both sound quality and performance. Its **sleek, contoured shape** not only enhances the M3 s aggressive stance but also ensures a snug fit behind the stock or upgraded exhaust system, minimizing gaps and improving overall exhaust flow. Whether paired with a full exhaust system or as a standalone upgrade, this muffler transforms the M3 s exhaust note into a deep, resonant growl that commands attention while maintaining the precision and responsiveness of the S54 engine. Ideal for enthusiasts seeking a subtle yet impactful modification, this component is a testament to BMW s engineering prowess and the aftermarket s ability to refine an already iconic performance machine.

### **Pros and Cons of Buying a BMW 333i (BM1N12, 2008 2013, M3 4.0L Rear Muffler)**

#### **Pros**

1. **Performance and Driving Dynamics**

The BMW 333i (BM1N12) is based on the M3 platform, meaning it inherits the S55 4.0L inline-six engine, which produces around **420 450 hp** (depending on tuning) and **369 lb-ft of torque**. This engine is known for its high-revving nature, strong mid-range power, and excellent throttle response. The M3 s chassis is stiff, well-balanced, and designed for aggressive driving, offering sharp handling and precise steering.

2. **Reliability of the S55 Engine**

The S55 is a robust engine when maintained properly. With **direct injection, twin-turbocharging, and a forged crankshaft**, it is built to last if kept on a proper maintenance schedule. Many examples with **under 100,000 miles** retain their original engines, though some may require **valve cover gaskets, oil leaks, or turbo upgrades** over time.

3. **Aftermarket Support and Tuning Potential**

The S55 is one of the most popular BMW engines for tuning, with a **thriving aftermarket** for parts like **turbo upgrades, fueling systems, and exhaust modifications**. A well-tuned 333i can easily exceed **500 hp** with minimal modifications, making it a great platform for enthusiasts.

4. **M3 Heritage and Prestige**

The M3 name carries significant prestige in the automotive world. Even a non-competition version like the 333i benefits from the **M3 s reputation for performance and driving enjoyment**, which can make it more desirable than a standard 335i.

5. **Comfort and Practicality**

Unlike the M3 s sportier sibling, the 333i is **less aggressive in suspension tuning**, offering a **softer ride** while still maintaining sharp handling. It also comes with **standard features** like **heated seats, premium sound systems, and available xDrive AWD**, making it more versatile than a track-focused M3.

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

While not as high as a well-maintained M3, the 333i holds its value better than a standard 335i due to its **performance-oriented nature**. However, resale depreciation is still a factor, especially if the car has been heavily modified.

---

#### **Cons**

1. **Maintenance Costs**

BMWs, especially performance-oriented ones like the 333i, are **expensive to maintain**. Common issues include:

- **Oil leaks** (valve cover, oil filter housing gasket, rear main seal)

- **Turbocharger failures** (especially if the car has been tuned aggressively)

- **Suspension wear** (control arms, bushings, struts)

- **Electrical gremlins** (common in BMWs, including sensor and wiring issues)

- **Transmission issues** (if the car has a **ZF 6HP21 automatic**, some have reported **slippage or rough shifting**)

**Budgeting for $1,000 $2,000/year in maintenance** is reasonable, but unexpected repairs can be costly.

2. **Rust and Bodywork Concerns**

Many early 2000s BMWs (including the E90/E92 generation) suffer from **rust**, particularly in the **wheel wells, sills, and undercarriage**. A thorough **underbody inspection** is essential before purchase.

3. **Fuel Economy**

The S55 engine is **not fuel-efficient** by modern standards. Expect **around 15 18 MPG in the city and 20 23 MPG on the highway**, which can be expensive to run, especially with high-performance modifications.

4. **Depreciation**

Like most BMWs, the 333i **loses value quickly**. If you plan to keep it long-term, be prepared for a **lower resale value** compared to the purchase price.

5. **Potential Modding Pitfalls**

While the S55 is tuner-friendly, **poor modifications** (cheap fueling, incorrect turbo upgrades, or software tuning) can **destroy the engine**. Only trust **reputable tuners** if you plan to modify it.

6. **Driving Experience Trade-offs**

- The **M3 s suspension is stiffer and more aggressive** than the 333i s, which may feel **less comfortable** on long drives.

- The **333i s interior is less sporty** than the M3 s, with **softer materials and fewer driver-focused features** (like the M3 s **M-Sport steering wheel and gear shifter**).

7. **Common Reliability Issues**

- **Oil consumption** (some S55 engines burn oil, requiring frequent checks)

- **Water pump failures** (can lead to catastrophic engine damage if ignored)

- **Exhaust manifold cracks** (common on early models)

- **Transmission solenoid failures** (if the car has a **ZF 6HP21**, some have reported **delayed shifts or failure to engage gears**)

---

### **Recommendation**

#### **Who Should Buy a BMW 333i (BM1N12, 2008 2013)?**

This car is **ideal for enthusiasts who want a balance of M3 performance with a more comfortable, practical daily driver**. It s a **great choice if you:**

- **Love BMWs and want a high-performance, engaging car** without the full M3 track focus.

- **Plan to maintain it properly** and are prepared for **higher-than-average maintenance costs**.

- **Enjoy tuning and modifying** the S55 engine (with caution).

- **Don t mind lower fuel economy** in exchange for **strong acceleration and driving fun**.

- **Are okay with some depreciation** and don t plan to sell it quickly.

#### **Who Should Avoid It?**

Avoid this car if you:

- **Can t afford or don t want to spend extra on maintenance** (rust repairs, engine work, transmission issues).

- **Prioritize fuel efficiency** over performance.

- **Don t enjoy BMWs quirks** (electrical issues, soft plastics, high repair bills).

- **Want a car that retains value well** (it won t).

- **Are not comfortable with performance driving** (the car is **fast and responsive**, which can be intimidating for inexperienced drivers).

#### **Final Recommendation**

If you **find a well-maintained example** (under **100,000 miles**, with **service records, no major rust, and a reliable engine**), the **BMW 333i is an excellent choice** for those who want **M3-like performance in a more refined package**. However, **budget for maintenance, inspect thoroughly for rust and mechanical issues, and consider getting a pre-purchase inspection (PPI) from a BMW specialist**.

For **best value**, look for:

- **A car with a known good engine** (check for **oil leaks, turbo health, and compression**).

- **A manual transmission** (if available), as they are **more reliable and fun to drive**.

- **A clean title and no accident history**.

- **A seller who provides full service records**.

If you re **serious about performance tuning**, ensure you re working with **trusted tuners** to avoid **engine damage**.

**Overall, it s a fantastic car for the right owner but not one to be taken lightly.**

Details:

SHIPPING: Shipping is only for the lower 48 states. Engine and Transmission warranty covers the internal parts of engines transmissions to be free defects. Fort Worth, TX 76140.

Mazda Nissan Heaven. 6711 Oak Crest Dr E.

part #: 333.bm1n12 prices

  • $200.00-$352.27

specifications emissyste:

  • for makes: Bmw
  • for years: 2008-2013
  • part type: Muffler
  • conditions options: Rear Muffler Scratches Scrap
  • genuine oem: Yes
  • ipn: 333.bm1n12
  • year: 2012
  • descriptionpartcondition: 08-13 Bmw M3 4.0l Rear Muffler Assembly 7840575
  • manufacturer warranty: 60 Day

returns emissyste:

  • time: 60 Days
  • paid by: Seller
  • policy: Returns Accepted

offer emissyste:

  • options: Seller-arranged-local-pickup
  • sold: 0
  • quantity: 1
  • availability: In Stock
  • started: March 16, 2026

general emissyste:

  • Car Truck Parts Accessories > Exhaust Emission Systems > Mufflers Resonators
  • condition: Used

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payments emissyste:

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  • credit card: Mastercard

seller emissyste:

  • city: Fort Worth, Texas
  • # reviews: 10313
  • rating: 99.7%
for makes: bmw, for years: 2008-2013, part type: muffler, conditions options: rear muffler scratches scrap, genuine oem: yes, year: 2012, descriptionpartcondition: 08-13 bmw m3 4.0l rear muffler assembly 7840575, manufacturer warranty: 60 day,
manufacturer: bmw, category: auto parts > car truck parts accessories > exhaust emission systems > mufflers resonators, sku: 20777227208808772,
Bmw 7840575 Is Similar To:
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5 offers $200.00–$352.27 USD
  • Used. Offer #1 priced at $246.50 + $129.00 shipping estimate = $375.50* total. The mileage and information about the donor's car can be found on the label in the pictures. 2013 BMW M3 Base 4.0L V8 - Gas.+$129.00 shipping
  • Used. Offer #2 priced at $352.27 + $Calculated shipping estimate = $352.27* total. For full item description.+$Calculated shipping
  • Used. Offer #3 priced at $200.00 + $Calculated shipping estimate = $200.00* total. Removed in 2016 at 50,000 miles BMW M3 E92 rear muffler.+$Calculated shipping
  • Used. Offer #4 priced at $200.00 + $41.17 shipping estimate = $241.17* total. no problems, came from 2009 m3.+$41.17 shipping
  • Used. Offer #5 priced at $297.50 + $150.00 shipping estimate = $447.50* total. +$150.00 shipping

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