1. Pistons, Rings, Rods & Parts Engines Components For Sale
  2. sku: 13591357712389772
  3. MAXPEEDINGRODS P45EXN

MAXPEEDINGRODS P45EXN Connecting Tu Conrod Rod Arp Moly 24V Steel

fits model: M50, M52, B25. make: Bmw.

P45exn Maxpeedingrods Connecting Rods For Bmw M50 M52 B25 Tu 24v Conrod Con Rod Arp Moly Quality Steel

( Brand: Maxpeedingrods ), ( Manufacturer Part Number: P45EXN ), ( Part Type: 24v Rod ), ( Big End Diameter: 48mm ), ( Big End Width: 21.9mm ), ( California Prop 65 Warning: California Prop 65 Warning ), ( Center To Center Length: 140mm ), ( Country Of Origin: China ), ( Material: Forged 4340 Aircraft Chrome Moly Quality Steel ), ( Note: No Instruction Included ), ( Notice: This Is Aftermarket Replcement Part ), ( Pin Type: Bronzed Bushing Floating Pin ), ( Quantity: 6 Pieces As Showing In Picture ), ( Small End Diameter: 22mm ), ( Weight Tolerance: Balanced To / 1 Gram In Set )

Review MAXPEEDINGRODS Connecting Rods Bmw Tu 24v Conrod Con Rod Arp Moly Quality Steel fits M50 M52 B25

The **Maxpeedingrods P45EXN** connecting rods are a meticulously engineered, high-performance upgrade designed exclusively for BMW s legendary inline-6 engines, including the **M50 and M52 B25 TU 24-valve configurations**. Crafted from **ARP-grade molybdenum steel**, these rods embody the pinnacle of strength and durability, ensuring they can withstand the extreme stresses of forced induction, aggressive driving, and high-revving applications without compromising structural integrity. Unlike stock rods, which are often optimized for stock power levels and longevity, the P45EXN rods feature a **thicker, more robust cross-section** with **optimized wall thickness and fillet radii**, significantly enhancing their resistance to fatigue failure even under extreme loads. The **precision-machined design** eliminates the weak points commonly found in stock rods, particularly around the bolt holes and rod ends, where stress concentrations can lead to catastrophic failure under heavy boost or high RPM conditions. These rods are **fully balanced** to match the weight of the stock rods, ensuring no adverse effects on engine harmony or vibration, while their **ARP-grade steel** provides a **yield strength of over 120,000 psi**, far exceeding the requirements of even the most demanding builds. Whether you're running a **turbocharged, supercharged, or nitrous-boosted M50/M52**, these rods deliver the confidence of knowing your engine is protected by components built to last without sacrificing performance or reliability. Perfect for **high-RPM applications, forced induction setups, or aggressive tuning projects**, the Maxpeedingrods P45EXN rods are the ultimate choice for those seeking a balance of strength, precision, and longevity in their BMW inline-6 engine.

### **Pros and Cons of Buying Maxpeedingrods P45EXN Connecting Rods for BMW M50/M52 B25 TU 24V Engines**

#### **Pros:**

1. **High-Strength Material** The rods are made from **ARP Moly Steel**, a material known for its exceptional strength-to-weight ratio. This alloy is designed to withstand extreme stress, making it ideal for high-performance applications, including forced induction and aggressive driving.

2. **Precision Machining** Maxpeedingrods is a reputable manufacturer that specializes in aftermarket engine components. Their rods undergo **strict quality control**, ensuring tight tolerances and consistent performance. This reduces the risk of premature failure compared to stock or lower-quality aftermarket rods.

3. **Increased Reliability Under Load** The M50/M52 engines, especially in tuned or turbocharged applications, are prone to rod fatigue over time. Upgrading to these rods can **extend engine life** by reducing stress on the crankshaft and pistons, particularly under high RPM or boost conditions.

4. **Compatibility with Stock and Upgraded Engines** The P45EXN rods are designed to fit the **B25 TU 24V** configuration (M50B25 and M52B25) without requiring major modifications. They maintain the same bolt pattern and dimensions as stock rods, allowing for a **direct drop-in installation** with minimal additional work.

5. **Reduced Risk of Catastrophic Failure** Stock rods in these engines are known to be a **weak point**, especially under forced induction or aggressive tuning. Upgrading to these rods can **significantly lower the risk of a rod failure**, which can cause severe engine damage.

6. **Lightweight Yet Durable** While they are stronger than stock rods, the **ARP Moly Steel** construction keeps them **lighter than forged steel rods**, reducing reciprocating mass. This can improve **high-RPM performance** and reduce stress on the crankshaft bearings.

7. **Warranty and Support** Maxpeedingrods offers a **warranty** on their products, providing peace of mind in case of manufacturing defects. Their customer support is also well-regarded for troubleshooting and installation guidance.

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#### **Cons:**

1. **Cost** These rods are **not cheap**, typically costing **several hundred dollars** for a set. This makes them a significant investment compared to stock rods or even some budget aftermarket options. The expense may not be justified for mild street applications without forced induction.

2. **Installation Complexity** While they are a **drop-in replacement**, installing them requires **careful attention to detail**. Improper handling (e.g., cross-threading, incorrect torque, or misalignment) can lead to failure. Some builders may need to **rebuild the engine** to ensure proper fitment, adding to labor costs.

3. **Limited Stock Availability** Maxpeedingrods is a specialized supplier, and their rods may not be as widely stocked as more mainstream aftermarket brands. This could mean **longer lead times** or the need to order directly from their website.

4. **Not a "Set-and-Forget" Solution** Even with upgraded rods, **proper engine maintenance** (oil changes, timing belt inspection, and regular tune-ups) is still critical. These rods are an improvement, but they do not eliminate the need for **responsible engine care**.

5. **Potential Overkill for Mild Applications** If the engine is **stock or only lightly modified** (e.g., minor tuning, no turbo), the stock rods may still last a long time. Upgrading to these rods may be **unnecessary** unless the engine is subjected to **aggressive driving, forced induction, or high RPM use**.

6. **Requires Complementary Upgrades** For maximum benefit, these rods should be paired with **other performance upgrades** (e.g., stronger crankshaft, upgraded pistons, high-flow oil pump, and proper lubrication). Installing them alone without supporting modifications may not yield significant benefits.

---

### **Conclusion and Recommendation**

The **Maxpeedingrods P45EXN ARP Moly Steel connecting rods** are a **high-quality, reliable upgrade** for the BMW M50/M52 B25 TU 24V engine, particularly in **tuned, turbocharged, or high-performance applications**. They offer **superior strength, durability, and reduced risk of catastrophic failure** compared to stock rods, making them a **strong consideration** for builders pushing these engines beyond stock limits.

However, they are **not a necessary upgrade** for **stock or mildly modified engines** running at normal RPM ranges. The **cost and installation effort** may not be justified unless the engine is subjected to **significant stress** (e.g., forced induction, aggressive tuning, or high-mileage use).

#### **Who Should Buy Them?**

- **Turbocharged M50/M52 builds** (especially with boost levels above 10-12 psi).

- **High-RPM enthusiasts** (e.g., track or drag racing applications).

- **Builders who have already upgraded other critical components** (crankshaft, pistons, oil system) and want to **future-proof their engine**.

- **Those who prioritize reliability** and are willing to invest in **long-term engine longevity**.

#### **Who Should Avoid Them?**

- **Stock or mildly modified engines** running at normal RPMs.

- **Builders on a tight budget** who cannot afford the cost or potential labor for installation.

- **Those who do not plan to push the engine aggressively** (e.g., daily drivers with minimal tuning).

#### **Final Recommendation:**

If you are **seriously modifying your M50/M52 B25 TU engine** (especially with forced induction) and want to **maximize reliability and performance**, the **Maxpeedingrods P45EXN rods are an excellent choice**. Pair them with **complementary upgrades** (crankshaft, pistons, oil system) and **proper installation techniques** to ensure the best results.

For **stock or lightly modified engines**, however, **stock rods may suffice**, and the expense of these rods may not be warranted. Always **consult with a trusted engine builder** before making such a significant upgrade to ensure it aligns with your engine s specific needs.

Details:

Specification, Quantity: 6 Pieces a set, Bolts: Including 3/8 ARP 2000 bolts Note: Extra cost for upgrading to L19 bolts, Material: Forged 4340 aircraft chrome moly quality steel racing, Weight Tolerance: Balanced /- 1 gram in set. Application, for BMW M50 M52 B25 TU 24V M52TUB25, 1998 - 2000 For E46 323i, 323Ci E39 523i E36/7 Z3 2.3i M52TUB25. Opening Hours: 7x24.

Dimensions, to length : 140mm, Big end diameter:48mm, Small diameter: 22mm, width : 21.9mm, 21.9mm.

part #: p45exn price

  • $562.51

specifications pistonrinro:

  • for models: M50, M52, B25
  • for makes: Bmw
  • brand: Maxpeedingrods
  • mpn: P45exn
  • part type: 24v Rod
  • big end diameter: 48mm
  • big end width: 21.9mm
  • california prop 65 warning: California Prop 65 Warning
  • center to center length: 140mm
  • country of origin: China
  • material: Forged 4340 Aircraft Chrome Moly Quality Steel
  • note: No Instruction Included
  • notice: This Is Aftermarket Replcement Part
  • pin type: Bronzed Bushing Floating Pin
  • quantity: 6 Pieces As Showing In Picture
  • small end diameter: 22mm
  • weight tolerance: Balanced To / 1 Gram In Set

returns pistonrinro:

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

general pistonrinro:

  • Car Truck Parts Accessories > Engines Engine Parts > Connecting Rods Parts
  • condition: New

offer pistonrinro:

  • best offers: True
  • sold: 0
  • availability: In Stock
  • quantity: 3
  • options: Ship-to-home
  • started: May 12, 2026

seller pistonrinro:

  • # reviews: 2759
  • rating: 99.9%
  • city: Houston, Texas

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  • class: Standard
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  • carrier: FedEx
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for models: m50, m52, b25, for makes: bmw, part type: 24v rod, big end diameter: 48mm, big end width: 21.9mm, california prop 65 warning: california prop 65 warning, center to center length: 140mm, country of origin: china, note: no instruction included, notice: this is aftermarket replcement part, pin type: bronzed bushing floating pin, quantity: 6 pieces as showing in picture, small end diameter: 22mm, weight tolerance: balanced to / 1 gram in set,
category: auto parts > car truck parts accessories > engines engine parts > connecting rods parts, material: forged 4340 aircraft chrome moly quality steel, sku: 13591357712389772,
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1 offer $562.51 USD
  • New. Offer #1 priced at $562.51 + $0.00 shipping estimate = $562.51* total. 1998-2000 For BMW E39 523i M52TUB25. For BMW M50 M52 B25 TU 24V M52TUB25.FREE SHIPPING

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