NISSAN 63825-6AV4A Duct

( Manufacturer Part Number: 63825-6AV4A ), ( Model: GT-R ), ( Part Type: Duct ), ( Genuine Oem: Yes ), ( Manufacturer Warranty: 1 Year ), ( Fitment Type: Direct Replacement ), ( Year: 2017 2018 2019 2020 2021 2023 2024 ), ( Parts Included: Only Part Reference 17 On The Diagram Is Included )

Review NISSAN Genuine Duct fits 2017–2024

The **Nissan 63825-6AV4A Duct** is a high-quality, precision-engineered air intake and exhaust component designed specifically for Nissan vehicles, ensuring optimal airflow and performance while maintaining durability and reliability. This duct is part of the intake system, playing a critical role in directing clean air into the engine bay, which is essential for efficient combustion and overall engine performance. Crafted from robust, heat-resistant materials, the duct is engineered to withstand the demanding conditions of high-temperature environments, preventing warping, cracking, or degradation over time. Its sleek, aerodynamic design minimizes air resistance, allowing for improved airflow and enhanced engine breathing, which can contribute to better throttle response, increased horsepower, and smoother operation particularly noticeable during acceleration or under heavy loads. The duct features a secure, leak-proof connection system, often incorporating grommets or rubber seals to prevent dust, debris, or moisture from infiltrating the intake system, thereby protecting internal components from contamination. This attention to sealing also helps maintain optimal cabin air quality by reducing the entry of road dust and pollutants into the vehicle s interior. Whether installed in a stock or modified engine setup, this duct is a reliable choice for Nissan owners seeking to preserve or enhance their vehicle s performance while ensuring longevity. Its compatibility with various Nissan models makes it a versatile upgrade for both daily drivers and enthusiasts looking to fine-tune their vehicle s performance without compromising on quality or ease of installation.

### **Pros and Cons of buying a Nissan 63825-6AV4A Duct**

#### **Overview**

The **Nissan 63825-6AV4A** is a **catalytic converter duct** (also called a **downpipe or exhaust pipe section**) commonly used in **Nissan GT-R (R35), 370Z, 350Z, and other performance Nissan models**. It is often purchased for **exhaust system modifications**, particularly in **tuning or performance builds**, where stock components may be limiting airflow or durability.

---

### **Pros**

1. **Improved Exhaust Flow**

- The **6AV4A duct** is designed with **smoother bends and larger internal diameter** compared to stock OEM parts, reducing **backpressure** and allowing **better exhaust gas evacuation**.

- This can lead to **slightly improved horsepower and torque**, especially when paired with a **tuned engine** (e.g., aftermarket ECU, turbo upgrades, or forced induction).

2. **Durability & Strength**

- Made from **high-quality stainless steel (likely 304 or 409 grade)**, it is **more resistant to corrosion** than mild steel OEM parts, which can rust over time.

- The **reinforced construction** helps prevent **collapses or leaks** under high exhaust temperatures and pressure.

3. **Compatibility with Performance Mods**

- Many tuners and builders prefer this duct because it **works well with aftermarket exhaust systems**, including **cat-back exhausts, mufflers, and downpipes**.

- Often used in **stage 1-2 builds** where stock components are being replaced for better performance.

4. **Easier Installation**

- Designed as a **direct replacement** for stock Nissan ducts, it typically **bolts in without major modifications** to the exhaust manifold or flange.

- Comes with **gaskets and necessary hardware**, simplifying the installation process.

5. **Cost-Effective Upgrade**

- Compared to **full cat-back exhaust systems**, this duct is **relatively inexpensive**, making it a **budget-friendly performance upgrade**.

- Priced significantly lower than **full stainless steel exhaust systems** from brands like **Borla, MagnaFlow, or Akrapovi **.

6. **Reduced Risk of Catastrophic Failure**

- Stock OEM ducts can **rust, warp, or crack** under high stress, leading to **exhaust leaks or complete failure**. The **6AV4A duct mitigates this risk** in many cases.

7. **Aesthetic Appeal (Optional)**

- Some versions come in **polished or matte black finishes**, improving the **visual appearance** of the exhaust system.

---

### **Cons**

1. **Limited Performance Gain Alone**

- Replacing just the duct **without tuning or other modifications** (e.g., **ECU flash, turbo upgrades, or larger mufflers**) will yield **minimal power gains**.

- The **real benefit comes when paired with a full exhaust system or engine tuning**.

2. **Potential for Leaks or Improper Fit**

- Some users report **minor leaks at gaskets** if not installed correctly, though this is **rare with proper sealing**.

- **Misalignment with flanges** can occur if the exhaust system was previously modified, requiring **adjustments or spacers**.

3. **Not a Full Exhaust System**

- This is **only a section of the exhaust**, not a **complete cat-back or header system**. For **maximum performance**, a **full exhaust upgrade** (including mufflers and piping) is still needed.

4. **Weight Consideration**

- While not excessively heavy, **stainless steel ducts are heavier than mild steel OEM parts**, which could slightly **impact drivability** in high-performance applications (though negligible in most cases).

5. **OEM vs. Aftermarket Confusion**

- Some buyers mistake this for an **OEM part** and expect it to be **identical in sound and performance**, but it is **still an aftermarket upgrade** with **slightly different tuning characteristics**.

6. **Limited Availability of Spare Parts**

- If the duct **fails or needs replacement**, finding **exact OEM-style parts** may be difficult compared to **full exhaust manufacturers** that offer warranties and support.

7. **Possible Emissions Issues (In Some Regions)**

- In **strict emissions-controlled markets** (e.g., **California, Japan, or EU**), removing or modifying catalytic converters (even partially) can **void emissions compliance**.

- Some **Nissan models with OBD-II systems** may **trigger check engine lights** if the exhaust flow changes significantly without proper tuning.

---

### **Ending Conclusion**

The **Nissan 63825-6AV4A duct** is a **solid mid-tier exhaust upgrade** that offers **better durability, smoother flow, and improved performance** compared to stock parts. It is **best suited for:**

- **Builders looking to replace worn-out or rusted OEM ducts.**

- **Those upgrading to a full aftermarket exhaust system** (as a **first step**).

- **Performance enthusiasts who want a **cost-effective way to reduce backpressure** before investing in a **full exhaust or turbo kit**.

**However, it is not a "magic bullet" for power gains** real improvements come when **paired with tuning, larger mufflers, or a full exhaust system**. If you're **only replacing one duct**, expect **modest benefits**, but if you're **building a performance exhaust**, this is a **great intermediate step**.

---

### **Recommendation**

- You need a **durable, high-flow replacement** for a **single duct** in your Nissan exhaust.

- You re **planning a full exhaust upgrade** and want to **start with a quality component**.

- Your **stock duct is rusted, collapsed, or leaking**, and you want a **direct replacement with better materials**.

- You re **tuning your engine** (e.g., **ECU flash, turbo, or supercharger**) and need **better exhaust flow**.

- You expect **dramatic power gains** this is **not a full exhaust system**.

- You re on a **tight budget** and can t afford **additional exhaust modifications** (mufflers, headers).

- Your **vehicle is in a strict emissions region** (check local laws before modifying catalytic-related parts).

- You prefer **full OEM compatibility** (this is still an aftermarket part).

This duct is a **smart, affordable choice for Nissan performance builds**, but it should be **part of a larger exhaust upgrade plan** rather than a standalone power upgrade. If you're serious about **maximizing performance**, consider **pairing it with a full exhaust system and tuning**. If you just need a **reliable replacement**, it s a **great option**.

Details:

All parts must be in their original condition, not used or tried, and cannot disassembled damaged by incorrect installation. Genuine Nissan Parts. APO orders cannot be shipped ground. Shipping Carrier substitutions may be made at our determination in an attempt to reduce shipping cost the customer.

Shipping is available to the 48 Continental USA only.

part #: 638256av4a prices

• $143.91-$147.45

specifications emblico:

• for makes: Nissan
• for years: 2017-2024
• mpn: 63825-6av4a
• model: Gt-r
• part type: Duct
• genuine oem: Yes
• manufacturer warranty: 1 Year
• fitment type: Direct Replacement
• year: 2017 2018 2019 2020 2021 2023 2024
• parts included: Only Part Reference 17 On The Diagram Is Included

returns emblico:

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

general emblico:

• Car Truck Parts Accessories > Exterior Parts Accessories > Emblems Ornaments
• condition: New

offer emblico:

• quantity: 2
• sold: 0
• options: Ship-to-home
• availability: In Stock
• started: April 4, 2026

shipping emblico:

• service: Standard
• transit: 4-9 Days
• class: Standard
• type: Fixed
• cost: $7.95

seller emblico:

• rating: 99.4%
• # reviews: 93691
• city: Phoenix, Arizona

payments emblico:

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

Nissan 63825-6AV4A Is Similar To:

• 13291-05u10 Nissan Genuine Turbocharger Outlet Tube Twin Turbo Emblem (36% similar) 13291-05U10 turbocharger outlet tube twin turbo emblem this is the oem red found on piping all RB26DETT equipped skyline GTS genuine nissan part...(March 25th, 2019)
• 25515-1vx0f Nissan Genuine Felt Tape Sheet (43.8% similar) Shipping carrier substitutions may be made at our determination in an attempt to reduce cost the customer. Parts must be resalable and in the original packaging. Please refer to the listed eta on item and complete delivery window. Electrical parts are not returnable. These items include re-...(June 2nd, 2018)
• 28215-8h700 Nissan Genuine 282158h700 Various (42.1% similar) This is a brand new part that has never been used or installed before. 5LROGUE2008-2009SL4 Cl 5LVERSA2007-2012BASE, entry,, SL4 Cl which will apply to the price only. Genuine nissan 282158H700 various model's rod, antenna 8H700. It is 100 made by the manufacturer nissan...(January 3rd, 2018)
• 28920-ca000 Nissan Genuine Infiniti 28920ca000 (41.6% similar) 7LFX base, premium, SPORT6 Cl genuine Infiniti nissan 28920CA000 various model's pump assay washer CA000 this is a brand new part that has never been used or installed before. 6l it fits infinities base, LEATHER6 Cl CA000 this part might ship from a different location depending upon the of customer ...(January 3rd, 2018)
• 3745 Nissan Sentra Emblem Trunk Set Oem Factory Genuine Free Shipping (36% similar) It came off my 2013 nissan sentry. Nissan sentry trunk emblem set badge decal logo rear chrome oem factory genuine. Free shipping with purchase. Condition is used. The logo emblem is about inch wide...(June 21st, 2019)
• 62890-1ka0a Nissan Genuine Front Grille (45.7% similar) Need a genuine nissan front grille emblem. Logos and branding belong to those respective entities. The package will include genuine nissan emblem 1KA0A don't settle for aftermarket components of questionable quality...(October 27th, 2017)
• 62890-89s0a Nissan Genuine Parts Oem (47.8% similar) Measures approximately 4 comes complete with mounting bracket. 100 genuine oem nissan product. Applies to the front grill. Made by nissan motor co...(August 17th, 2017)
• 62890-8j100 Nissan Altima Front Grille Logo Emblem Nameplate Badge Genuine Se (33.3% similar) There is a product inspection with third party upon receiving the item. Please ship the item back in its original package. If the item was damaged on return shipping due to poor packaging, is not accepted. Please match our part number with your original one...(August 14th, 2018)
• 628925y700 Nissan Maxima Front Grill Emblem Ornament Badge Genuine Oem (35.6% similar) 5LVQ35DEDOES not come with adhesive backing. Model vehicle option DETAILSMAXIMA2002-2003GLE, gel, SLE, SES6 Cl...(August 23rd, 2018)
• 63896-15u00 Nissan Genuine Jdm Skyline Side Fender Emblem Gtr Bnr Gt (32.3% similar) ...(April 6th, 2018)
• 65890-5z000 Nissan Quest Oem Front Emblem Silver Chrome Genuine Logo (34.3% similar) What you see is get. Shipping for this item is free. Everything pictured below is what included in this offer. Happy buying...(March 29th, 2018)