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Y Pipe Downpipe Exhaust/Test Pipes for 2003-2009 Nissan 350Z 3.5L 2005, 2007 Infiniti G35
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$128.00
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Fitment
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Build a Better-Flowing VQ35DE Exhaust System
The Flashark Y-Pipe is designed for 2003–2009 Nissan 350Z and 2003–2007 Infiniti G35 3.5L V6 applications. It replaces the restrictive factory merge section with a smoother dual-inlet-to-single-outlet exhaust path for a deeper VQ tone and a more responsive feel.
Choose the Y-Pipe by itself for a straightforward exhaust upgrade, or select a compatible package to pair it with test pipes, headers, or a cat-back system. Each option is designed for a different stage of your build—please confirm the selected package matches your vehicle before ordering.
WHY CHOOSE THE FLASHARK Y-PIPE?
- 2.5-Inch Dual Inlets to 3-Inch Outlet: Smooth transition from the dual-bank exhaust path into a single merged outlet.
- T-304 Stainless-Steel Construction: Built for heat resistance and long-term corrosion resistance.
- Mandrel-Bent Tubing: Helps maintain consistent internal diameter through each bend.
- TIG-Welded Joints: Strong weld construction for repeated heat cycles.
- CNC-Machined Flanges: Designed for precise connection points and reliable sealing with the included hardware.
OFF-ROAD USE ONLY
This product removes or bypasses factory emissions equipment (catalytic converters). It is legal only for off-road, competition, or track use. Installing this product on a vehicle registered for public road use violates the Clean Air Act (42 U.S.C. § 7401) and may result in fines, failed emissions testing, or registration denial. Check your state and local laws before purchasing. By ordering, you accept full responsibility for compliance.
Specifications
Brand: Flashark
SKU: FLES08311
Application: Y-Pipe Downpipe Exhaust / Test Pipes (Catless)
Material: Stainless steel
Finish: Mirror-polished
Inlet Diameter: 2.5" (dual-bank entry)
Outlet Diameter: 3.0" (single merge exit)
Construction: Mandrel-bent tubing, TIG-welded joints, CNC-machined flanges
Flanges: CNC-machined and chrome-plated — strength, sealing, and corrosion resistance
Catalytic Converter: None
Estimated Power Gain: 8-12 HP with ECU tune; 5-8 ft-lbs of torque with ECU tune
Emissions Compliance: Not compliant — for off-road/competition use only
Warranty: 1-year
Built for Better Flow and a Stronger VQ Sound
The factory exhaust path on the 350Z and G35 can feel restrictive once you start upgrading the rest of the car. This Flashark Y Pipe Downpipe Exhaust/Test Pipes kit helps exhaust gases move more smoothly through the front and mid exhaust area, reducing restriction and giving the car a more open tone.
Instead of making unrealistic power claims, this part should be viewed as one piece of a complete exhaust setup. Paired with a compatible catback, headers, intake, or tune, it can help the VQ35 feel more responsive and sound more alive without making the build overly complicated.
Stock Downpipe vs Flashark Y-Pipe Downpipe
The stock exhaust section on a 350Z or G35 is built for quiet daily use, factory comfort, and broad drivability. That works well for an untouched car, but it can start to feel restrictive when you want stronger sound and better exhaust response from the VQ35.
The Flashark Y Pipe Downpipe Exhaust/Test Pipes kit uses larger free-flow tubing, stainless steel construction, and a smoother exhaust path to help reduce restriction. The result is a deeper tone, cleaner exhaust movement, and estimated gains of 10-15 HP and 5-10 ft-lbs of torque when the rest of the setup supports it.
Built for the VQ35 Exhaust Layout
This Flashark Y Pipe Downpipe Exhaust/Test Pipes kit is made for the naturally aspirated VQ35 exhaust layout found on the 350Z and G35. It helps reduce restriction through the front and mid-exhaust area, giving the car a deeper tone, cleaner flow, and a sharper feel when you get back on the throttle.
For owners comparing a 350Z downpipe, 350Z Y-pipe, or 350Z test pipes upgrade, the main goal is simple: better exhaust movement, a stronger sound, and a more connected driving feel when the rest of the setup is properly matched.
Package Includes
1 × Y-Pipe Downpipe
3 × Flange Gaskets
6 × Hex Head Bolts
6 × Flange Nuts
Inspect all gasket surfaces and verify hardware matches your current exhaust connection points before installation.
Delivery, Return, and Protection
DELIVERY: Free Shipping. Estimated in 3-5 Working Days.
Fast Shipping Policy: Your order will be dispatched within 1-2 business days, and the package will arrive within your order's estimated date.
Easy Return Policy: Every order comes with a 14-day free return, provided the item is brand new, uninstalled, and in its original packaging. We cover return shipping for quality issues. Refunds are processed within 3-5 business days.
Worry-Free Delivery Protection: Add Worry-Free Delivery at checkout — if it's lost, stolen, or damaged, you're 100% covered.
Recommended Exhaust Pairings
Many 350Z and G35 owners upgrade the exhaust in stages, so keeping the current recommended-upgrade module is useful for both fitment comparison and conversion. This kit can be paired with a compatible 350Z catback exhaust for a fuller rear-section upgrade, or matched with VQ35DE exhaust headers on compatible 2003-2007 builds.
| Years | Make | Model | Engine |
|---|---|---|---|
| 2003-2009 | Nissan | 350Z Coupe (Z33) | VQ35DE / VQ35HR 3.5L |
| 2003-2007 | Infiniti | G35 Coupe (CV35) | VQ35DE 3.5L |
| 2003-2006 | Infiniti | G35 Sedan (V35) | VQ35DE 3.5L |
Pro Tip: The 350Z used the VQ35DE (2003-2006) and VQ35HR (2007-2009). Both share the same Y-pipe and test-pipe flange positions, so this kit fits either engine variant. The G35 Coupe and Sedan both use the VQ35DE exclusively. To confirm your engine, check the eighth digit of your VIN: VQ35DE = "V", VQ35HR = no separate VIN code (check production date July 2007+).
Q: Is this a downpipe, Y-pipe, or test pipes? What's the difference?
A: This Flashark kit combines three terms into one product. On the 350Z/G35 VQ35 (naturally aspirated) exhaust layout, "test pipes" are the catless sections that replace the front catalytic converters between the exhaust manifold and the Y-pipe. The "Y-pipe" is the merge section where the two exhaust banks combine into one pipe heading toward the catback. This kit includes both sections as a single bolt-on assembly—so you get the full front-to-mid exhaust flow upgrade in one package.
Q: What does "Catless / Test Pipe" mean? Is this legal for street use?
A: "Catless" and "test pipe" both mean this product has **no catalytic converter** inside the exhaust section. Factory catalytic converters restrict flow for emissions compliance; removing them opens up the exhaust path for better flow and sound—but it also means the vehicle will not pass emissions testing in most states. This product is legal **only for off-road, track, or competition use**. See the ⚠️ OFF-ROAD USE ONLY notice at the top of this page. Check your local and state laws before ordering.
Q: Why does the G35 fitment say 2003-2007 instead of just 2005 and 2007?
A: The G35 Coupe (CV35) and Sedan (V35) share the same FM platform and VQ35DE engine as the 350Z (Z33). The exhaust Y-pipe and test-pipe flange geometry is consistent across all production years of the G35 (2003-2007 Coupe, 2003-2006 Sedan). The original "2005, 2007" listing was incomplete—the kit fits the entire G35 Coupe run (2003-2007) and Sedan run (2003-2006). Confirm your body style and flange positions before ordering.
Q: Does this fit both VQ35DE and VQ35HR engines on the 350Z?
A: Yes. The 350Z used the VQ35DE from 2003-2006 and the VQ35HR from 2007-2009. While the HR has revised intake-side components, the exhaust-side flange positions (manifold outlet → test pipe → Y-pipe) are compatible across both engine variants. This kit bolts on to either DE or HR 350Z without modification. Note: the VQ35HR was never used in the G35—all G35s have the VQ35DE.
Q: How much horsepower does this add?
A: Estimated gains are **8-12 HP with ECU tune** and **5-8 ft-lbs of torque with ECU tune**, depending on your full exhaust setup, engine condition, and tune quality. On a stock ECU calibration, gains are more modest (around 3-5 HP). For maximum benefit, pair this kit with a compatible catback, headers, and a proper tune. Do not expect dramatic standalone gains—this is a flow improvement, not a turbo upgrade.
Q: Do I need a tune after installing this?
A: A tune is **recommended but not strictly required** for this part alone. Removing catalytic converters changes exhaust backpressure, which can shift fuel trims and affect O2 sensor readings. If you combine this kit with headers, intake, or a full catback, a proper ECU tune becomes essential for drivability, fuel economy, and power delivery.
Q: Will this cause a check engine light (CEL)?
A: Removing the front catalytic converters typically triggers a CEL for "catalyst efficiency below threshold" (P0420/P0430) because the downstream O2 sensors no longer see the expected catalytic cleaning effect. Solutions include: (1) O2 sensor spacers/defoulers to delay sensor readings, (2) an ECU tune that disables the catalyst monitor, or (3) keeping the rear catalytic converters in place (if your exhaust still has them). This is a common issue with all catless test-pipe products, not specific to Flashark.
Q: Does this fit the G35 Coupe and G35 Sedan?
A: Both are listed in the fitment table. The G35 Coupe (CV35, 2003-2007) and Sedan (V35, 2003-2006) share the same VQ35DE engine and FM platform. The Y-pipe and test-pipe flange positions are consistent across both body styles. However, the Sedan has a longer wheelbase—this affects the mid-pipe and catback section length, not the Y-pipe/test-pipe section near the engine. Verify your flange positions before ordering if you have a Sedan.
Q: Can I pair this with Flashark headers and catback for a full exhaust?
A: Yes. This kit is designed to work within the Flashark VQ35 exhaust ecosystem. Pair it with Flashark VQ35DE exhaust headers (2003-2006) and a 350Z/G35 catback for a complete front-to-rear exhaust upgrade. The "2003-2006 Y Pipe + Header" variant bundles the two front-section pieces, and the "2003-2009 Y Pipe + Catback" variant bundles the mid and rear sections.
Q: What's the difference between T-304 and T-409 stainless steel?
A: This kit uses **T-304** stainless steel, which is the premium grade for exhaust components. T-304 has higher chromium (18-20%) and nickel (8-10.5%) content than T-409, giving it superior corrosion resistance, better heat tolerance, and a longer service life. T-409 is adequate for downpipes but can develop surface rust over time. T-304 maintains its mirror-polished finish and structural integrity even after years of heat cycling.
Q: Does the +Header variant fit 2007-2009 350Z (VQ35HR)?
A: No. The "2003-2006 Y Pipe + Header" variant includes VQ35DE-specific headers that do **not** fit the VQ35HR (2007-2009 350Z). The HR engine has different exhaust manifold geometry and outlet positions. If you have a 2007-2009 350Z, order the base Y Pipe Downpipe variant (fits DE and HR) or the Y Pipe + Catback variant (fits both), and source HR-specific headers separately.
Q: How do I identify my engine—VQ35DE or VQ35HR?
A: Check your VIN. The eighth digit is the engine code: **"V" = VQ35DE**. For the 350Z, production dates from **July 2007 onward** typically indicate the VQ35HR (higher redline, 306 HP vs 287 HP). For the G35, all years (2003-2007 Coupe, 2003-2006 Sedan) use the VQ35DE exclusively. You can also check the redline on your tachometer—DE redlines at ~6,600 RPM, HR at ~7,500 RPM.
Fast Shipping Policy
Your order will be dispatched within 1-2 business days, and the package will arrive within your order's estimated date. Click for Shipping Policy
Easy Return Policy
Every order comes with a 14-day free return, provided the item is brand new, uninstalled, and in its original packaging. We cover return shipping for quality issues. Refunds are processed within 3-5 business days. Click for Return Policy
Worry-Free Delivery Protection
Add Worry-Free Delivery at checkout — if it's lost, stolen, or damaged, you're 100% covered. Click for Worry-Free Delivery Protection