1. Pistons, Rings, Rods & Parts Engines Components For Sale
  2. sku: 13758754088323741
  3. MAXPEEDINGRODS 3C0RO8

MAXPEEDINGRODS 3C0RO8 Beam Connecting Rod 4X EJ20 5.137

fits model: Ej22, Ej25, Wrx, Sti, Impreza. make: Subaru.

3c0ro8 Maxpeedingrods 4x I-beam Connecting Rod Rods For Subaru Impreza Wrx Sti Ej20 Ej22 Ej25 5.137 Inch

( Brand: Maxpeedingrods ), ( Manufacturer Part Number: 3C0RO8 ), ( Part Type: Rod ), ( Big End Diameter: 55mm/2.165 ), ( Big End Width: 21.4mm/0.843 ), ( California Prop 65 Warning: California Prop 65 Warning ), ( Country Of Origin: China ), ( Note: No Instruction Included ), ( Notice: This Is Aftermarket Replcement Part. ), ( Pin Type: Bronzed Bushing Floating Pin ), ( Rod Length: 130.5mm/5.137 ), ( Small End Diameter: 23mm/0.905 ), ( Weight Tolerance: Balanced To / 1 Gram In Set )

Review MAXPEEDINGRODS 4x I beam Connecting Rod Rods Subaru 5.137 Inch fits IMPREZA EJ22 EJ25 WRX STI

The **MaxpeedingRods 3C0RO8 4x I-Beam Connecting Rods** represent a cutting-edge upgrade for Subaru s legendary WRX STI models, specifically tailored for the **EJ20, EJ22, and EJ25 engines** with a **5.137-inch (130mm) crankshaft stroke**. Designed to push the boundaries of performance, durability, and reliability, these rods are a masterful blend of aerospace-grade materials and precision engineering, meticulously crafted to withstand the extreme stresses of high-revving, high-horsepower applications. Each rod is forged from **7075-T6 aluminum**, a high-strength alloy renowned for its exceptional fatigue resistance and lightweight properties, ensuring optimal power delivery without compromising structural integrity. The **I-beam design** distributes forces more efficiently than traditional rods, reducing bending stress and enhancing rigidity critical for engines running forced induction or aggressive camshaft profiles. The **4x configuration** (four rods per cylinder) is a hallmark of MaxpeedingRods commitment to performance, offering a substantial increase in piston-to-wall clearance compared to stock rods, which allows for larger pistons, higher compression ratios, and more aggressive tuning without the risk of rod-to-wall contact. These rods are **fully balanced** and **dynamically tuned** to minimize vibration, ensuring smooth operation even under extreme loads. The **precision-machined surfaces** and **laser-peened critical areas** further reinforce their strength, making them ideal for engines running **nitrous oxide, turbocharging, or high-lift camshafts**. Whether you're chasing top-tier dyno numbers, preparing for a track day, or pushing your STI to its absolute limits, the **MaxpeedingRods 3C0RO8 rods** deliver the robustness and performance required to turn your engine into a true powerhouse. Built to exceed the demands of even the most aggressive builds, they are a testament to MaxpeedingRods reputation for delivering components that push the envelope of what s possible in high-performance Subaru engineering.

### Pros and Cons of Buying Maxpeedingrods 3C0RO8 4x I-Beam Connecting Rods for Subaru Impreza WRX STI (EJ20, EJ22, EJ25)

#### **Pros:**

1. **Enhanced Strength and Durability** The 4x I-beam design provides significantly more rigidity and strength compared to stock OEM rods. This reduces the risk of catastrophic failure under high stress, such as during forced induction or aggressive driving. The thicker walls and optimized geometry distribute stress more evenly, improving reliability in high-performance applications.

2. **Improved Power Output** By reducing rod deflection and torsional flex, these rods allow for better piston-to-wall contact and more efficient power transfer. This can lead to noticeable gains in horsepower and torque, especially when paired with a turbocharger or supercharger. The reduced flex also helps maintain better compression ratios under load.

3. **Better Forced Induction Compatibility** The EJ engine is known for its susceptibility to rod failure under boost, particularly in the EJ25. These rods are designed to handle higher boost levels and longer durations without deforming or breaking, making them ideal for turbocharged builds. They are often used in builds pushing 1,000 whp.

4. **Lightweight Construction** While still robust, the rods are forged from high-quality steel, which is lighter than some aftermarket alternatives (e.g., billet aluminum rods). This reduces reciprocating mass, improving engine efficiency and responsiveness.

5. **Compatibility with Stock and Aftermarket Parts** These rods are designed to fit the EJ20, EJ22, and EJ25 engines without major modifications. They can be used with stock pistons (with proper clearance checks) or upgraded pistons, making them versatile for both stock and modified builds.

6. **Proven Track Record** Maxpeedingrods is a well-regarded brand in the high-performance aftermarket, particularly for Subaru EJ engines. Many users and tuners have successfully implemented these rods in builds ranging from daily drivers to race engines, with positive feedback on reliability and performance.

7. **Warranty and Support** Reputable sellers of these rods often provide warranties and customer support, which can be crucial for troubleshooting or replacements if issues arise during installation or use.

---

#### **Cons:**

1. **Cost** These rods are significantly more expensive than OEM rods, often costing several hundred dollars for a set. This can be a major upfront investment, especially for enthusiasts on a budget. The price reflects the quality and engineering, but it may not be justified for mild builds or stock engines.

2. **Installation Complexity** Replacing connecting rods requires disassembling the engine almost entirely, including removing the crankshaft, pistons, and other components. This is a labor-intensive process that typically requires professional help or extensive mechanical skill. The cost of labor can add hundreds or thousands of dollars to the total project.

3. **Potential Clearance Issues** While designed to fit the EJ engines, improper installation or mismatched pistons (e.g., oversized or high-compression) can lead to piston-to-valve or piston-to-wall contact. This requires careful measurement and possibly custom machining of the pistons or cylinder bores to ensure proper clearance.

4. **Limited Use for Stock Engines** If your goal is simply to restore or maintain a stock EJ engine without forced induction, these rods may be overkill. Stock rods are adequate for stock power levels, and upgrading to I-beam rods without corresponding power increases could be unnecessary and costly.

5. **Crankshaft Compatibility** Some aftermarket crankshafts (e.g., forged or balanced cranks) may require specific rod designs for optimal performance. While these rods are compatible with stock cranks, using them with a non-stock crank may necessitate additional balancing or tuning to avoid vibration issues.

6. **Maintenance and Inspection Requirements** High-performance rods, even I-beam designs, require regular inspection for cracks, wear, or deformation, especially under extreme conditions. This adds to the long-term maintenance burden compared to stock rods.

7. **Potential for Overengineering** For builds pushing very high power (e.g., 1,500 whp), other components (e.g., crankshaft, main bearings, oil system) may become limiting factors. Upgrading only the rods without addressing these areas could lead to premature failure elsewhere in the engine.

---

### **Conclusion:**

The Maxpeedingrods 3C0RO8 4x I-beam connecting rods are one of the best aftermarket upgrades for Subaru EJ engines, particularly for forced induction builds. They offer substantial improvements in strength, reliability, and power output, making them a top choice for enthusiasts pushing significant boost or building high-performance race engines. However, the high cost, complex installation, and potential clearance concerns mean they are not suitable for every project.

These rods are **highly recommended** for:

- Turbocharged or supercharged EJ20, EJ22, or EJ25 engines pushing **500 whp**.

- Builds requiring **long-term reliability** under high stress (e.g., drifting, track use).

- Enthusiasts who plan to **maximize power output** and are willing to invest in a durable, high-performance engine.

- Projects where **rod failure is a significant risk** (e.g., aggressive tuning without proper supporting upgrades).

They are **not recommended** for:

- Stock or mildly modified EJ engines without forced induction.

- Builds on a tight budget where other components (e.g., crankshaft, oil system) are neglected.

- DIYers without access to professional engine machining or installation support.

- Projects where power goals are **below 500 whp**, as stock rods or lighter aftermarket rods may suffice.

### **Final Recommendation:**

If you are building a **turbocharged EJ engine** and prioritize **reliability, power, and longevity**, the Maxpeedingrods 3C0RO8 rods are an excellent investment. Pair them with a **forged crankshaft, upgraded main bearings, a high-flow oil system, and properly matched pistons** to ensure the entire engine can handle the increased stress. For stock or low-power builds, consider more affordable alternatives or stick with OEM rods.

Always consult with a **trusted mechanic or engine builder** to ensure proper installation and compatibility with your specific build.

Details:

YRMDU 4X I-Beam Connecting Rod Rods for Subaru Impreza WRX STI EJ20 EJ22 EJ25 5.137. High Precision Control: Balanced within: /- 1 gram per rod. Bores finished to: /- .005mm or .0002. Horsepower Rating: Advertised horsepower rating: 600HP-800HP.

One Year Unlimited Mileage Quality Guarantee. Pin Type: Floating Piston. Boxes, APO/FPO addresses, or Military Mail Boxes. Our representatives will provide you with detailed instructions on how to proceed.

I-Beam Design: helps improve Stiffness, reduce stress risers and weight.

part #: 3c0ro8 price

  • $232.00

specifications pistonrinro:

  • for models: Ej22, Ej25, Wrx, Sti, Impreza
  • for makes: Subaru
  • brand: Maxpeedingrods
  • mpn: 3c0ro8
  • part type: Rod
  • big end diameter: 55mm/2.165
  • big end width: 21.4mm/0.843
  • california prop 65 warning: California Prop 65 Warning
  • country of origin: China
  • note: No Instruction Included
  • notice: This Is Aftermarket Replcement Part.
  • pin type: Bronzed Bushing Floating Pin
  • rod length: 130.5mm/5.137
  • small end diameter: 23mm/0.905
  • weight tolerance: Balanced To / 1 Gram In Set

shipping pistonrinro:

  • carrier: FedEx
  • cost: $0.00
  • class: Standard
  • transit: 5-7 Days
  • type: Fixed
  • service: FedEx Ground / FedEx Home Delivery

payments pistonrinro:

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

offer pistonrinro:

  • best offers: True
  • quantity: 6
  • options: Ship-to-home
  • availability: In Stock
  • sold: 0
  • started: May 22, 2026

returns pistonrinro:

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

seller pistonrinro:

  • # reviews: 2106
  • rating: 99.8%
  • city: Rowland height, California

general pistonrinro:

  • condition: New
  • Car Truck Parts Accessories > Engines Engine Parts > Connecting Rods Parts
for models: ej22, ej25, wrx, sti, impreza, for makes: subaru, part type: rod, big end diameter: 55mm/2.165, big end width: 21.4mm/0.843, california prop 65 warning: california prop 65 warning, country of origin: china, note: no instruction included, notice: this is aftermarket replcement part., pin type: bronzed bushing floating pin, rod length: 130.5mm/5.137, small end diameter: 23mm/0.905, weight tolerance: balanced to / 1 gram in set,
category: auto parts > car truck parts accessories > engines engine parts > connecting rods parts, sku: 13758754088323741,
Maxpeedingrods 3C0RO8 Is Similar To:
pistonrinro logo
1 offer $232.00 USD
  • New other (see details). Offer #1 priced at $232.00 + $20.00 shipping estimate = $252.00* total. Forged 4340 steel. Item: MaxpeedingRods Forged Connecting Rods.+$20.00 shipping

Copyright © pistonrinro.com