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SKU: 304-131-201
Weapon-R Secret Weapon Cold Air Extension Pipe – 2003-2006 Nissan 350Z / Infiniti G35
The Weapon-R Secret Weapon Cold Air Extension Pipe (extension pipe only) is the #1 selling add-on for Secret Weapon Intake systems on 2003-2006 Nissan 350Z and Infiniti G35 (VQ35DE). High-quality 6061 aluminum mandrel-bent polished pipe extends intake length for increased air volume, higher velocity, and reduced turbulence the ultimate extension upgrade for any 350Z/G35 build seeking maximum airflow, better mid-range torque, and show-quality engine bay finish when paired with the Secret Weapon filter and velocity stack.
Key Features
- Secret Weapon Technology – Creates dual air velocity profiles for 3x more air volume and speed to the engine
- 6061 Aluminum Construction – High-quality material bent on automated CNC mandrel bender for smooth flow
- Polished Finish – Mirror-like show quality shine enhances engine bay aesthetics
- Extension Pipe Only – Designed to work with Secret Weapon filter, velocity stack, and heat shield
- 1 Million Mile Limited Warranty – Confidence in durability and performance
| Spec | Detail |
|---|---|
| Part Number | 304-131-201 |
| Brand | Weapon-R |
| Type | Secret Weapon Cold Air Extension Pipe |
| Material | 6061 Aluminum |
| Finish | Polished |
| Compatibility | 2003-2006 Nissan 350Z / Infiniti G35 (VQ35DE) – extension pipe only |
| Country of Origin | United States |
| Warranty | 1 Million Mile Limited Warranty |
Whats Included
- 1 x Weapon-R Secret Weapon Cold Air Extension Pipe (polished aluminum)
- Mounting hardware and clamps (if required)
- Installation instructions
Product Notes
- Extension pipe only – requires Secret Weapon filter, velocity stack, and heat shield for complete intake system
- Increases air intake volume and velocity for improved mid-range torque and high-RPM power
- Polished finish only – complements engine bay aesthetics on 350Z/G35
Installation Notes
- Bolt-on extension to existing Secret Weapon intake components
- Estimated time: 30–60 minutes
- Professional installation recommended for proper alignment and leak-free fitment
This Part Fits
| Year Range | Make | Model | Trim / Engine | Notes |
|---|---|---|---|---|
| 2003-2006 | Nissan | 350Z | All trims | 3.5L VQ35DE – extension pipe only |
| 2003-2006 | Infiniti | G35 | Base / X / Sport | 3.5L VQ35DE – extension pipe only |
Why Choose Weapon-R Secret Weapon Extension Pipes?
- #1 choice for patented high-velocity intake extensions on VQ35DE engines
- Built & tested in the United States
- Chosen by 350Z/G35 owners for noticeable power gains, cooler IATs, and polished show quality
Frequently Asked Questions
-
Q: Does this fit my 2005 Nissan 350Z?
A: Yes, direct fit extension pipe for 2003-2006 Nissan 350Z and Infiniti G35 3.5L (VQ35DE). -
Q: Is this the complete intake?
A: No, extension pipe only; requires Secret Weapon filter, velocity stack, and heat shield for full system. -
Q: Will it increase power?
A: Yes, increases air volume and velocity for improved mid-range torque and high-RPM performance.
Shipping & Handling
- Method: Ground UPS or FedEx
- Availability: In stock – ships same or next business day
- Packaging: Official Weapon-R retail box
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