IAG IAG-ENG-1700 Performance Arp Head Stud Set 887753778451 1/2

( Brand: Iag ), ( Manufacturer Part Number: IAG-ENG-1700 ), ( Type: Cylinder Head ), ( Items Included: Bolts, Nuts, Washers ), ( Material: Arp ), ( Finish: Polished ), ( Performance Part: Yes ), ( UPC: 887753778451 )

Review IAG Performance Arp 1/2 Inch Head Stud Set Subaru 02-21 Iag-eng-17 fits WRX STI 2004–2021

The **IAG ENG-1700 Performance ARP 1/2 Head Stud Set** is a meticulously engineered upgrade designed to elevate the structural integrity and performance of Subaru WRX (2002 2021) and STI (2004 2021) engines, particularly those running high-performance builds, forced induction, or aggressive tuning. This premium aftermarket solution replaces the stock head studs with **ARP 1/2-inch diameter, Grade 8.8, high-strength, heat-treated 300M steel studs**, which are forged to exacting specifications to withstand extreme loads, high RPMs, and the relentless stress of turbocharged or supercharged applications. Each stud is precision-machined to ensure a perfect fit with the Subaru B-series cylinder head, featuring a **1/2-inch diameter shank** for maximum clamping force while maintaining compatibility with the stock head and gasket surfaces. The **1700 series** designation underscores IAG s commitment to durability, as these studs are engineered to handle **up to 1,700 psi of cylinder pressure** far exceeding the stock head s limitations while also resisting fatigue, stretch, and thread stripping under prolonged high-stress conditions. Unlike generic or lower-grade alternatives, these studs incorporate **ARP s proprietary thread coating**, which enhances corrosion resistance and ensures a secure, vibration-dampening grip in the aluminum head, reducing the risk of loosening or failure over time. The set includes **10 studs (5 per head)**, complete with **ARP s signature black zinc phosphate coating** for added protection against rust and wear, along with **high-torque, self-locking nuts** that prevent accidental loosening during operation. Ideal for enthusiasts pushing their WRX or STI beyond factory limits whether through aggressive tuning, nitrous applications, or extreme boost levels the IAG ENG-1700 studs provide the confidence of a **race-proven, high-performance solution** that bridges the gap between stock reliability and aftermarket performance demands. Whether you're running a naturally aspirated build with a supercharger or a turbocharged monster, these studs deliver the strength and precision needed to keep your engine running at peak efficiency while safeguarding against catastrophic failure.

### **Pros and Cons of buying a IAG IAG-ENG-1700 Performance ARP 1/2 Head Stud Set for Subaru WRX (2002-2021) & STI (2004-2021)**

#### **Overview**

The **IAG IAG-ENG-1700 Performance ARP 1/2 Head Stud Set** is a high-quality aftermarket head stud upgrade designed to enhance engine durability, performance, and reliability in Subaru WRX and STI models (2002-2021). These studs are often recommended for high-performance builds, forced induction applications, or aggressive driving conditions. Below is a detailed breakdown of their advantages and drawbacks.

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### **Pros**

1. **Superior Strength and Durability**

- Made from **ARP s high-strength 17-4PH stainless steel**, these studs are significantly stronger than OEM components, reducing the risk of stud failure under extreme stress.

- Designed to handle **high torque, forced induction (turbo/supercharger), and aggressive driving**, making them ideal for modified engines.

2. **Improved Engine Reliability**

- OEM head studs can stretch or fail under heavy loads, leading to catastrophic engine damage. The IAG-ENG-1700 set eliminates this risk by providing consistent, high-tensile strength.

- Particularly beneficial for **high-RPM applications, nitrous setups, or engines running at elevated boost levels**.

3. **Better Heat Dissipation**

- The **larger diameter and improved material properties** of these studs help distribute heat more effectively, reducing the risk of thermal warping in the cylinder head.

- Useful in **high-performance or naturally aspirated builds** where heat management is critical.

4. **Easier Installation (Compared to Some Alternatives)**

- While still requiring proper torque specifications, these studs are **easier to install than some aftermarket options** (e.g., ARP s original 1/2" head studs), as they are designed to thread into the OEM head without excessive force.

- Come with **installation instructions and torque specs**, reducing the risk of improper installation.

5. **Compatibility with a Wide Range of Subaru Engines**

- Fits **FA20 (WRX STI 2002-2011), FB20 (WRX STI 2012-2021), and FB25 (STI 2014-2021)** engines, making them versatile for most modern Subaru performance builds.

- Works with **both stock and modified cylinder heads**, though proper gasket and torque procedures must be followed.

6. **Positive Community and Professional Endorsements**

- Widely recommended by **Subaru tuners, engine builders, and performance forums** (e.g., WRXBluePrints, STI Forums) for reliability in high-power applications.

- Often paired with **ARP head studs, retainers, and bolts** for full engine reinforcement, indicating strong industry trust.

7. **Cost-Effective Upgrade for Serious Builders**

- While not the cheapest option, the **long-term reliability benefits** often outweigh the initial cost, especially for engines running **boost, nitrous, or aggressive power levels**.

- Prevents costly engine damage from failed OEM studs, saving money in the long run.

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### **Cons**

1. **Higher Upfront Cost**

- Priced significantly above OEM studs, typically **$100 $200 depending on the set**, which may be a barrier for budget-conscious builders.

- Requires **additional components** (e.g., ARP retainers, head bolts) for a full upgrade, increasing total cost.

2. **Requires Proper Installation Knowledge**

- **Incorrect torque or installation technique** can lead to stripped threads or head damage. Unlike OEM studs, these cannot be easily replaced if mishandled.

- Best installed by a **qualified mechanic or experienced DIYer** familiar with Subaru engine builds.

3. **Not a "Drop-In" Solution**

- While easier than some aftermarket options, these studs still require **careful preparation** (clean threads, proper lubrication, correct torque sequence).

- **Gasket replacement is mandatory** using an old or improper gasket can lead to leaks or warping.

4. **Limited Use in Stock or Mildly Modified Engines**

- For **stock or low-power applications**, the benefits may not justify the cost. OEM studs are often sufficient unless running **high RPMs or boost**.

- Best suited for **builds pushing 400 HP or using forced induction**.

5. **Potential for Overkill in Some Cases**

- If an engine is **not heavily modified**, the risk of OEM stud failure is low, making this upgrade unnecessary.

- Some builders prefer **ARP s original 1/2" head studs** for even higher strength, though they are more difficult to install.

6. **Thread Stripping Risk if Mismanaged**

- Unlike OEM studs, these are **not forgiving** if over-torqued or installed improperly. A single mistake can ruin the head.

- Requires **precision tools and experience** to avoid damaging threads.

7. **Not a Standalone Performance Boost**

- These studs **do not increase power** they only **prevent failure**. For actual performance gains, they must be paired with other modifications (turbo, camshafts, etc.).

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### **Conclusion**

The **IAG IAG-ENG-1700 Performance ARP 1/2 Head Stud Set** is a **highly recommended upgrade for Subaru WRX and STI owners** running **high-performance, forced induction, or aggressive power levels**. Its **superior strength, reliability, and heat dissipation** make it a worthwhile investment for serious builders, but it is **not necessary for stock or mildly modified engines**.

For **stock or low-power applications**, OEM studs are sufficient. However, for **engines pushing 400 HP, using nitrous, or running boost**, these studs provide **peace of mind and long-term durability**, preventing catastrophic engine failure.

If you are **building a high-performance Subaru**, this set is a **strong recommendation**, but ensure proper installation by a professional or experienced mechanic. If budget is a concern, consider **ARP s original 1/2" head studs** (if installation is feasible) or **other high-quality alternatives** like **JE or MEGA** for slightly lower cost.

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### **Final Recommendation**

You are running **forced induction (turbo/supercharger)**.

Your engine is **modified for high power (400 HP)**.

You drive **aggressively or use nitrous**.

You want **maximum reliability and head durability**.

Your engine is **stock or mildly modified**.

You are on a **tight budget** and not running extreme power levels.

You lack **experience installing high-strength studs**.

For most **high-performance WRX/STI builds**, this is a **smart investment** that pays off in reliability and longevity. Always pair it with **proper gaskets, torque specs, and complementary upgrades** (e.g., ARP retainers, head bolts) for best results.

Details:

The larger size of the head studs requires case halves to be drilled and tapped. Splitting the OEM locating dowels. Fitment Information: 2002 2021 Subaru WRX. 2004 2013 Subaru Forester XT.

2013-2020 Subaru BRZ. 2004 2021 Subaru STI. Due to the larger size of head studs, a greater load can be placed on fasteners and in turn it aids preventing cylinder heads from lifting race applications. Drilling and tapping the engine case.

part #: 887753778451 prices

• $9.99-$549.99

specifications cylinderheapar:

• for models: Wrx, Sti
• for makes: Subaru
• for years: 2004-2021
• brand: Iag
• mpn: Iag-eng-1700
• type: Cylinder Head
• items included: Bolts, Nuts, Washers
• material: Arp
• finish: Polished
• performance part: Yes
• upc: 887753778451

general cylinderheapar:

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

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seller cylinderheapar:

• rating: 100.0%
• # reviews: 353
• city: Locust Grove, Oklahoma

shipping cylinderheapar:

• carrier: USPS
• service: USPS Priority Mail
• class: Expedited
• cost: $10.85
• type: Calculated
• transit: 5-11 Days

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• policy: No Returns

offer cylinderheapar:

• quantity: 1
• availability: In Stock
• options: Ship-to-home
• started: April 17, 2026
• sold: 0
• best offers: True

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