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Downpipe Exhaust/Test Pipes for 2003-2006 Nissan 350z Infiniti G35 With Gaskets And Bolts
1 Item · 2003-2006 Nissan 350z Infiniti G35 Test Pipe · SKU: FLES08324
$110.00
Product Specifications
Free-Flow Test Pipes for 350Z and G35 Builds
A freer-flowing exhaust path can make a VQ-powered 350Z or G35 feel sharper, louder, and more responsive without changing the full exhaust system at once. This Flashark downpipe exhaust/test pipes kit is built for listed 2003-2006 Nissan 350Z and selected 2003-2007 Infiniti G35 VQ35DE applications, replacing the restrictive factory catalytic converter sections between the exhaust manifolds and Y-pipe.
These pipes are designed for drivers who want stronger exhaust flow, a deeper tone, and better pull through the upper rpm range on an off-road or track-focused setup. Depending on the full exhaust setup, tune, engine condition, and installation quality, this kit supports an estimated 10-15 HP and 5-10 ft-lbs of torque.
Specifications
| Product Type | Test Pipes |
| Model | DP17517-SL / MT001118 |
| Material | 16-gauge T-304 stainless steel |
| Finish | Polished / mirror-polished finish |
| Pipe Size | 2.5-inch inlet and 2.5-inch outlet |
| Flange Type | 2-bolt and 3-bolt mounting flanges |
| Welding | TIG-welded construction |
| Estimated Gain | Supports an estimated 10-15 HP and 5-10 ft-lbs of torque depending on setup and installation |
| Use Case | Off-road, track, and performance exhaust builds where legal |
Key Features
- Estimated performance support: Supports an estimated 10-15 HP and 5-10 ft-lbs of torque when paired with the right exhaust setup, tune, and installation quality.
- Free-flow exhaust design: Helps reduce restriction after the exhaust manifolds for smoother exhaust movement and sharper throttle response.
- VQ sound change: Adds a deeper, louder, and more aggressive exhaust tone compared with the factory catalytic converter sections.
- 16-gauge T-304 stainless steel: Built for heat resistance, corrosion resistance, and long-term use in a high-temperature exhaust area.
- 2.5-inch inlet and outlet: Designed around a 2.5-inch pipe layout to match the listed VQ35DE exhaust path.
- Mandrel-bent tubing: Helps keep exhaust flow more consistent through the bends.
- TIG-welded joints: Welded for strength around high-heat exhaust connection points.
- CNC-machined flanges: Helps improve sealing and alignment when matched with the correct vehicle and hardware.
- Included hardware: Comes with test pipes/downpipes, gaskets, and bolts for the listed application.
Why This Test Pipe Upgrade Fits the 350Z and G35 Platform
The Nissan 350Z Z33 and Infiniti G35 V35 are popular VQ35DE platforms because they respond well to intake, exhaust, catback, and tuning upgrades. The factory catalytic converter sections are built for quiet operation, emissions control, and long-term daily driving, but they can become a restriction point for owners building a louder and freer-flowing exhaust setup.
Flashark downpipe exhaust/test pipes are designed to replace that restrictive section with a freer-flowing stainless steel pipe layout. The goal is not to change the character of the car completely, but to help the VQ35DE move exhaust more efficiently, sharpen throttle response, add a deeper exhaust note, and support an estimated 10-15 HP and 5-10 ft-lbs of torque depending on the full setup, tune, engine condition, and installation quality.
Built for Better Flow and Sound
The factory catalytic converter sections on a 350Z or G35 can limit exhaust flow, especially when the car already has intake, headers, catback, or tuning upgrades. This test pipe setup reduces restriction in that section of the exhaust path, helping the VQ35DE breathe more freely through the mid and upper rpm range.
The sound change is one of the biggest reasons owners choose this upgrade. Expect a louder tone, sharper revs, and a more raw VQ exhaust note. On some setups, especially with a non-resonated or straight-through rear exhaust setup, the car may also produce more rasp or drone.
OEM Downpipe vs Aftermarket Downpipe/Test Pipe
| Area | Factory Catalytic Converter Section | Flashark Test Pipes / Downpipes |
|---|---|---|
| Exhaust Flow | More restrictive factory layout built for quiet operation and emissions control | Freer-flowing pipe design to reduce restriction after the exhaust manifolds |
| Power Support | Limited by the factory catalyst section as mileage and heat cycles add wear | Supports an estimated 10-15 HP and 5-10 ft-lbs of torque depending on setup |
| Sound | Quieter and more muted | Louder, deeper, and more aggressive |
| Long-Term Restriction | Old or failing catalytic converter sections may clog or reduce flow over time | Removes that restriction point, but also removes factory catalyst function in this section |
| Emissions | Factory emissions equipment retained | For off-road or track use where legal |
| CEL Risk | Lower risk when factory parts are working correctly | Possible check engine light depending on sensors, tune, and setup |
Downpipes vs Test Pipes on the 350Z and G35
On many turbo cars, a downpipe connects to the turbocharger outlet. The 350Z and G35 VQ35DE platform is naturally aspirated, so this part does not work as a turbo downpipe. On this platform, many shoppers still use downpipe, test pipe, and catless downpipe as common search terms for the same general upgrade area.
Technically, this kit replaces the factory catalytic converter sections between the exhaust manifolds and the Y-pipe. It combines the common downpipe search intent with the actual test pipe function: reducing restriction, improving exhaust flow, changing sound, and supporting better response on a performance exhaust setup.
What Is Included
- 2 x Test pipes / downpipes
- Gaskets
- Bolts and installation hardware
Shipping & Returns
Free U.S. Shipping: Orders are typically processed within 1–2 business days and delivered within 7–9 business days. Additional charges may apply to remote areas.
30-Day Returns: Unopened and unused items in their original packaging may be returned within 30 days of receipt. Return shipping is covered for verified quality issues.
Worry-Free Delivery: Optional protection against eligible loss, theft, delay, or transit damage is available at checkout.
