1. Pistons, Rings, Rods & Parts Engines Components For Sale
  2. sku: 13807211977253782
  3. MAXPEEDINGRODS DFHKP4

MAXPEEDINGRODS DFHKP4 Titanized Connecting Rod Arp EJ20 5.137

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

Dfhkp4 Maxpeedingrods Titanized Connecting Rod Rods For Subaru Impreza Sti Ej20 Ej22 Ej25 Arp 5.137 Inch

( Brand: Maxpeedingrods ), ( Manufacturer Part Number: DFHKP4 ), ( Part Type: Rod ), ( Big End Diameter: 55mm/2.165 ), ( Big End Width: 21.38mm/0.840 ), ( California Prop 65 Warning: California Prop 65 Warning ), ( Country Of Origin: China ), ( Fit For: For Subaru Ej18 Ej20 Ej22 Ej25 Ej207 Ej257 Sti ), ( Fitment Type: Performance/custom ), ( Fits: 02-05 For Subaru Impreza Sti Forester Legacy 2.0l Ej205 ), ( Ipn: 02-05 ), ( Material: Titanizing 4340 Aircraft Chrome Moly Quality Steel ), ( Note: Instruction Included ), ( Notice: This Is Aftermarket Replcement Part ), ( Pin Type: Bronzed Bushing Floating Pin ), ( Quality: Forged Rods With Tuv Certification ), ( Quantity: Set Of 4 Pieces ), ( Rod Length: 130.5mm/5.137 ), ( Small End Diameter: 23mm/0.905 ), ( Surface Finish: Brand New ), ( Weight Tolerance: Balanced To / 1 Gram In Set )

Review MAXPEEDINGRODS Titanized Connecting Rod Rods Subaru Arp 5.137 Inch fits IMPREZA EJ22 EJ25 STI

The **Maxpeeding Rods DFHKP4 Titanium Connecting Rods** represent the pinnacle of performance engineering for Subaru s legendary **EJ20, EJ22, and EJ25** engines, particularly in the high-revving, track-focused **STI** applications. Designed with precision and built to withstand extreme demands, these **ARP 5.137-inch bolted titanium rods** are a game-changer for enthusiasts seeking to maximize power output, durability, and reliability whether on the street, at the drag strip, or on the racetrack. Crafted from **Grade 5 titanium**, these rods offer an unmatched strength-to-weight ratio, reducing reciprocating mass by nearly **30%** compared to forged steel counterparts while maintaining or even exceeding the structural integrity required for high-performance applications. The **titanium alloy** not only enhances engine efficiency by reducing inertia but also resists fatigue better than traditional materials, making them ideal for forced-induction builds, nitrous setups, or aggressive tuning scenarios where reliability is paramount.

The **DFHKP4** designation signifies a **fully machined, high-strength titanium design** optimized for Subaru s **EJ-series engines**, featuring a **5.137-inch bolt pattern** compatible with **ARP 5.137 bolts**, ensuring a secure and stress-free connection to the crankshaft. Each rod undergoes **rigorous CNC machining** to achieve precise wall thickness and taper, eliminating weak points while maintaining a **smooth, balanced profile** that minimizes vibration and stress concentrations. The **titanium s natural damping properties** further reduce harmonic distortion, contributing to a more refined and responsive engine character critical for engines pushing beyond stock limits. Whether paired with a **turbocharged, supercharged, or naturally aspirated** EJ engine, these rods deliver **superior strength** without the excessive weight of steel, allowing for higher RPM stability and improved torque delivery.

For the **Subaru Impreza STI** owner pushing their **EJ20, EJ22, or EJ25** to its limits, the **Maxpeeding Rods DFHKP4** are a **must-have upgrade** for those targeting **forced induction, nitrous, or aggressive camshaft setups**. The rods are **fully compatible** with stock crankshafts, though they are equally suited for **aftermarket cranks** when paired with a proper **big-end bearing setup** (such as **ARP or ISCAR bearings**). Their **lightweight yet robust construction** ensures that the engine can rev higher with confidence, while the **titanium s corrosion resistance** guarantees longevity even in harsh conditions. Whether you're building a **track-focused STI**, a **high-RPM street machine**, or a **forced-induction monster**, these rods provide the **ultimate balance of strength, weight savings, and reliability** making them a **premium choice** for serious Subaru enthusiasts who refuse to compromise on performance.

### **Pros and Cons of Buying Maxpeedingrods DFHKP4 Titanium Connecting Rods for Subaru Impreza STI (EJ20, EJ22, EJ25) with ARP 5.137 Bolts**

#### **Pros**

1. **Material Strength and Weight Savings**

- Titanium rods are significantly lighter than forged steel, reducing reciprocating mass. This improves engine balance, reduces stress on the crankshaft, and can enhance high-RPM performance and longevity.

- Titanium has excellent strength-to-weight properties, making it ideal for high-performance applications where weight reduction is beneficial.

2. **Durability and Fatigue Resistance**

- Titanium is highly resistant to corrosion and fatigue, which can be advantageous in high-stress applications where traditional steel rods might fail over time.

- When properly installed with high-quality bolts (like ARP 5.137), titanium rods can handle extreme loads without deforming or cracking.

3. **Performance Gains**

- Reduced reciprocating mass can improve engine response, especially in turbocharged or forced-induction applications where piston acceleration is critical.

- The stiffness of titanium can help reduce rod bounce, leading to more consistent power delivery and reduced stress on other components.

4. **Compatibility with ARP 5.137 Bolts**

- The ARP 5.137 bolts are designed for high-performance applications and work well with titanium rods, providing the necessary clamping force without over-tightening.

- This combination is often used in extreme builds (e.g., nitrous, forced induction, or high-RPM applications) where reliability is paramount.

5. **Custom Fit and Engineering**

- Maxpeedingrods is known for precision machining and custom-fit rods, ensuring a proper fit for the EJ20, EJ22, and EJ25 engines.

- The DFHKP4 model is specifically designed for these Subaru engines, with optimized dimensions for power output and durability.

6. **Potential for Long-Term Reliability**

- If properly installed and maintained, titanium rods can outlast traditional steel rods in high-stress environments, reducing the risk of catastrophic failure.

---

#### **Cons**

1. **High Cost**

- Titanium rods are significantly more expensive than forged steel rods. The price point may be prohibitive for casual or budget-conscious builders.

- Additional costs may include ARP bolts, installation labor, and potential modifications to the engine bay for proper clearance.

2. **Installation Complexity**

- Installing titanium rods requires precision and expertise. Improper installation (e.g., incorrect torque, misalignment, or improper gasket sealing) can lead to failure.

- Some builders may need to consult with a professional mechanic or engine builder to ensure proper fitment and assembly.

3. **Maintenance and Inspection Requirements**

- Titanium rods, while durable, still require regular inspection for signs of wear, cracking, or bolt stretch. Unlike steel, titanium does not deform visibly before failure, so visual checks may not always detect issues.

- The ARP bolts must be checked for stretch and retorqued at recommended intervals to maintain integrity.

4. **Potential for Overkill in Mild Applications**

- If the engine is not heavily modified (e.g., stock or mildly tuned), the benefits of titanium rods may not be fully realized. Forced induction or extreme power levels are where titanium truly shines.

- In less demanding applications, the cost may not justify the upgrade.

5. **Limited Availability and Lead Times**

- Custom or specialty parts like these may have longer lead times or limited stock, requiring advance ordering.

- If the rods are not compatible with aftermarket pistons or crankshafts, additional modifications may be needed.

6. **Risk of Improper Fitment**

- While Maxpeedingrods rods are well-engineered, improper clearance with the oil pan, valve cover, or other components could lead to interference or installation difficulties.

- Some builders may need to modify the engine bay or use spacers to accommodate the rods.

---

### **Conclusion**

Maxpeedingrods DFHKP4 titanium connecting rods paired with ARP 5.137 bolts are an excellent choice for **high-performance Subaru Impreza STI engines (EJ20, EJ22, EJ25) running forced induction, nitrous, or extreme power levels**. The weight savings, durability, and fatigue resistance make them a premium upgrade for serious builders who prioritize reliability and performance. However, the high cost, installation complexity, and need for proper maintenance make them less ideal for stock or mildly modified engines.

If your build involves **significant power gains, high RPMs, or aggressive tuning**, these rods are a worthwhile investment. For **stock or lightly modified engines**, a high-quality forged steel rod kit (e.g., ARP, JE, or custom forged rods) may offer better value without sacrificing performance.

### **Recommendation**

- **For extreme builds (turbocharged, nitrous, or high-RPM applications):** Proceed with the Maxpeedingrods titanium rods and ARP 5.137 bolts. Ensure proper installation by consulting an experienced engine builder.

- **For mild to moderate builds (stock or mildly tuned):** Consider a forged steel rod kit (e.g., ARP or JE) for better cost efficiency while still improving reliability.

- **Always pair with a high-quality crankshaft, pistons, and proper lubrication** to maximize the benefits of titanium rods.

Ultimately, the decision depends on your budget, power goals, and willingness to invest in a premium, high-performance solution.

Details:

Advertised Horsepower Rating:200HP/piece, Top acceleration: 9000rpm, package size 28CM 21CM 10CM. PRODUCT DISPLAY Titanized Connecting Rod Rods for Subaru Impreza STI EJ20 EJ22 EJ25 ARP 5.137. Titanizing can further improve the bending strength of product: Guaranteed, Fitment Always the, correct part.

Each rod is magnetic particle tested to ensure free of flaws. 9.High precision CNC machined,Precision rod cap alignment dowels. Fast Shipping. Telephone number.

The density of titanium is significantly lower than that steel, while maintaining considerable strength, which means it lighter but the strength very similar. H-Beam design reduces weight without compromising strength. For Subaru Impreza WRX STI EJ20 EJ22 EJ25 Engine, Legacy Forester 2.0L Turbo EJ205 Engine 2002 - 2005, STi EJ207 1998 -present, 2.5L EJ255 2006 -2014, EJ257 2004 -2016, Saab 9-2X 2005 - 2006, Isuzu Asoka 1990 -1993, 1989 -2009, SF series 1997 - 2002 , XT 2004 -2013, Outback 2005, 2007 -2009, Impreza 95-01, 95-96, Pin Type: Floating Piston.

part #: dfhkp4 price

  • $232.00

specifications pistonrinro:

  • for models: Ej22, Ej25, Sti, Impreza
  • for makes: Subaru
  • brand: Maxpeedingrods
  • mpn: Dfhkp4
  • part type: Rod
  • big end diameter: 55mm/2.165
  • big end width: 21.38mm/0.840
  • california prop 65 warning: California Prop 65 Warning
  • country of origin: China
  • fit for: For Subaru Ej18 Ej20 Ej22 Ej25 Ej207 Ej257 Sti
  • fitment type: Performance/custom
  • fits: 02-05 For Subaru Impreza Sti Forester Legacy 2.0l Ej205
  • ipn: 02-05
  • material: Titanizing 4340 Aircraft Chrome Moly Quality Steel
  • note: Instruction Included
  • notice: This Is Aftermarket Replcement Part
  • pin type: Bronzed Bushing Floating Pin
  • quality: Forged Rods With Tuv Certification
  • quantity: Set Of 4 Pieces
  • rod length: 130.5mm/5.137
  • small end diameter: 23mm/0.905
  • surface finish: Brand New
  • weight tolerance: Balanced To / 1 Gram In Set

seller pistonrinro:

  • city: Rowland height, California
  • # reviews: 3734
  • rating: 99.7%

payments pistonrinro:

  • credit card: Mastercard
  • wallet: Google-pay
  • other

offer pistonrinro:

  • options: Ship-to-home
  • best offers: True
  • quantity: 1
  • started: May 25, 2026
  • availability: In Stock
  • sold: 0

general pistonrinro:

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

returns pistonrinro:

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

shipping pistonrinro:

  • type: Fixed
  • carrier: FedEx
  • service: FedEx Ground / FedEx Home Delivery
  • class: Standard
  • transit: 3-7 Days
  • cost: $0.00
for models: ej22, ej25, sti, impreza, for makes: subaru, part type: rod, big end diameter: 55mm/2.165, big end width: 21.38mm/0.840, california prop 65 warning: california prop 65 warning, country of origin: china, fit for: for subaru ej18 ej20 ej22 ej25 ej207 ej257 sti, fitment type: performance/custom, fits: 02-05 for subaru impreza sti forester legacy 2.0l ej205, note: instruction included, notice: this is aftermarket replcement part, pin type: bronzed bushing floating pin, quality: forged rods with tuv certification, quantity: set of 4 pieces, rod length: 130.5mm/5.137, small end diameter: 23mm/0.905, surface finish: brand new, weight tolerance: balanced to / 1 gram in set,
category: auto parts > car truck parts accessories > engines engine parts > connecting rods parts, material: titanizing 4340 aircraft chrome moly quality steel, sku: 13807211977253782,
Maxpeedingrods DFHKP4 Is Similar To:
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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

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