2008-2013 Test Pipe Exhaust Downpipe 2.5" for 2009-2018 Nissan 370Z Z34 Infiniti G37 3.7L V6

SKU: XKV21060
Availability : In Stock Pre order Out of stock
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Fitment & Specs
Fits selected 2009–2018 Nissan 370Z Z34 and 2008–2013 Infiniti G37 3.7L V6 Coupe / Sedan applications, plus Infiniti Q50 / Q60 models equipped with the 3.7L engine. Does not fit Q50 / Q60 2.0L or 3.0T models. Verify model year, engine, chassis, catalytic converter layout, O2 sensor setup, and exhaust connection before purchase.
2.50" Inlet · 2.50" Outlet
Stainless Steel · Catless Test Pipe Set
Before You Buy: Off-road/racing use only · Professional install recommended · Tuning may be required
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Description

This 2.5" catless test pipe exhaust set is designed for page-listed Nissan / Infiniti 3.7L V6 applications, including 2009–2018 Nissan 370Z Z34, 2008–2013 Infiniti G37 3.7L V6 Coupe / Sedan, and listed Infiniti Q50 / Q60 3.7L models. It is intended as a catless test pipe / decat exhaust component for compatible VQ37 exhaust layouts.

Built with 2.5" inlet and outlet sizing, 2-bolt mounting style, mandrel-bent piping, and welded CNC flanges as listed, this test pipe set is designed to replace selected restrictive factory catalytic converter sections where compatible. Final fitment, sound, exhaust sealing, O2 sensor behavior, drivability, and performance results may vary depending on vehicle condition, engine setup, exhaust layout, installation quality, tuning or calibration, emissions setup, and supporting components.

Product Overview

This product is a catless test pipe exhaust set for compatible Nissan 370Z and Infiniti 3.7L V6 applications. It is not a turbo downpipe, header set, catback exhaust system, full exhaust system, catalytic converter, 2.0L Q50/Q60 pipe, 3.0T Q50/Q60 pipe, or universal exhaust component. Please verify your exact model year, engine, chassis, O2 sensor layout, flange connection, downstream exhaust connection, and emissions requirements before purchase.

Key Details

  • Fitment: Page-listed Nissan 370Z, Infiniti G37, and Infiniti Q50 / Q60 3.7L applications
  • Product Type: Catless Test Pipe Exhaust Set / Decat Pipe Set
  • Inlet Diameter: 2.50" as listed
  • Outlet Diameter: 2.50" as listed
  • Mounting Style: 2-bolt mounting style as listed
  • Construction: Mandrel-bent piping with welded CNC flanges as listed
  • Emissions Component: Catless / decat / test pipe design as listed
  • Important Exclusion: Does not fit Infiniti Q50 / Q60 2.0L or 3.0T models as listed
  • Installation: Professional installation highly recommended
  • Instruction: No installation instructions included; refer to a shop or factory manual as listed
  • Use Case: Off-road, racing, competition, or closed-course use where emissions laws apply

Fitment

Please use the table below to quickly confirm the main vehicle applications currently listed for this catless test pipe set. Before ordering, verify your exact model year, engine, chassis, O2 sensor layout, flange connection, downstream exhaust layout, and emissions setup.

Vehicle Name Year Engine Notes
Nissan 370Z Z34 2009–2018 3.7L V6 Verify chassis, flange layout, O2 sensor position, and downstream exhaust connection
Infiniti G37 Coupe / Sedan 2008–2013 3.7L V6 Verify coupe / sedan configuration, flange layout, O2 sensor position, and exhaust connection
Infiniti Q50 / Q60 Page-listed 3.7L applications 3.7L V6 only Does not fit 2.0L or 3.0T models as listed; verify exact engine and exhaust layout before purchase
Fitment Note: This table is based on the fitment information currently listed for this product. This catless test pipe set is listed for Nissan 370Z Z34, Infiniti G37 3.7L V6, and Infiniti Q50 / Q60 3.7L applications. It does not fit Q50 / Q60 2.0L or 3.0T models as listed. Please verify your exact model year, chassis, engine, O2 sensor layout, flange connection, downstream exhaust configuration, and emissions setup before purchase.

Package Includes

  • 2 test pipe / exhaust pipe components as shown
  • 4 gaskets as listed
  • 1 pack of screws and nuts as listed
  • Additional hardware, bolts, clamps, or accessories included only if shown or listed

Please review the product photos and listing details before installation. Confirm all included pipe components, flanges, gaskets, screws, nuts, and connection requirements against the received package before beginning installation.

Installation Notes

  • Professional installation is highly recommended.
  • No installation instructions are included; refer to a shop or factory manual where appropriate.
  • Test fit both pipe components before final tightening.
  • Verify flange alignment, gasket seating, O2 sensor position, and downstream exhaust compatibility before installation.
  • Check clearance around the transmission area, heat shields, underbody, wiring, O2 sensor harnesses, and surrounding exhaust components.
  • Old, rusted, or seized factory hardware may increase installation difficulty.
  • Catless / decat pipe installation may require compatible tuning, calibration, or sensor-related solutions depending on vehicle setup.
  • Inspect all exhaust connections for leaks after installation and recheck fasteners after initial heat cycles where appropriate.

Before You Buy

  • This product is intended for page-listed Nissan / Infiniti 3.7L V6 applications only.
  • This is a catless test pipe exhaust set, not a turbo downpipe, header set, catback exhaust system, full exhaust system, catalytic converter, or universal exhaust component.
  • Please verify your exact model year, engine, chassis, O2 sensor layout, flange connection, downstream exhaust connection, and emissions setup before purchase.
  • Infiniti Q50 / Q60 applications are listed for 3.7L models only. This product does not fit 2.0L or 3.0T models as listed.
  • This product removes or replaces selected catalytic converter sections and may alter emissions-related exhaust components depending on the vehicle setup.
  • Compatible tuning, calibration, or sensor-related solutions may be required depending on O2 sensor configuration and ECU setup.
  • This product is intended for off-road, racing, competition, or closed-course use where emissions laws apply.
  • This product is not represented as street legal, emissions-compliant, CARB-compliant, or legal for public road use unless explicitly stated.
  • Performance gains, sound changes, exhaust flow changes, fitment, O2 sensor behavior, and drivability results are not guaranteed and may vary by setup.
Shipping & Return

SHIPPING & DELIVERY
Fast Processing & Reliable Transit

  • Processing: Orders are processed and shipped from the nearest available warehouse within 1 business day after payment.
  • Delivery: Estimated delivery time is approximately 3–4 business days after shipment.
  • Shipping - Free shipping on all orders within the contiguous 48 U.S. states.

RETURNS & EXCHANGES
30-Day Hassle-Free Policy

  • Return Window: We offer a 30-day return policy from the date of delivery.
  • Item Condition: Returned items should be unused, uninstalled, and in their original packaging when possible.
  • Return Process: To initiate a return or exchange, please contact our customer service team first to receive authorization and instructions.

WARRANTY
2-Year Limited Replacement Warranty

  • Duration: All products are backed by a 2-year limited warranty.
  • Coverage: This warranty covers manufacturing defects and product failures under normal use, and provides a replacement for qualified cases (repairs are not performed).

CUSTOMER SUPPORT
We’re Here to Help – Contact Us First

  • Priority Contact: For any order-related issues—including returns, warranty claims, or general inquiries—please contact us first before taking further action. We are committed to resolving your concern promptly.
  • Feedback Notice: If you are unsatisfied, we kindly ask that you allow us an opportunity to address the issue before leaving neutral or negative feedback.
  • Email Support: You can reach us at support@XKVracing.com.

Downpipe Buying Guide

A Key Section in a Turbocharged Exhaust System

The downpipe connects directly to the turbocharger and routes exhaust gases into the rest of the exhaust system. It is one of the first exhaust components downstream of the turbo.

Because of its position, the design of the downpipe influences how exhaust gases move away from the turbo and into the remaining exhaust path.

What Drivers May Observe

More consistent exhaust flow downstream of the turbocharger

Reduced restriction compared to some factory exhaust layouts

Smoother boost delivery under certain operating conditions

Changes in exhaust tone, depending on system setup

Catted vs Catless

Catted Downpipe

Includes a catalytic converter designed for specific applications
Used where emissions considerations or regulations apply
Often selected for vehicles intended for street use, where permitted

Catless Downpipe

Does not include a catalytic converter
Typically intended for off-road, competition, or export use
Used in applications where different regulatory standards apply

Is a Downpipe Right for Your Build?

Own a turbocharged vehicle

Are upgrading intake, intercooler, or exhaust components

Want improved exhaust efficiency and response

Are building a balanced street or track setup

FAST SHIPPING

Ships within 1 business day after payment
3–4 business day delivery

Secure and Reliable Checkout

Secure checkout with major payment options

LOCAL WAREHOUSE

Orders ship from U.S. warehouses when available

Easy Returns and Exchanges

30-day returns for eligible unused items

Parts Warranty

Warranty support for qualified manufacturing defects

Important Notice

Products on this site are intended for off-road, racing, or closed-course use where emissions laws apply. They are not represented as street legal, emissions-compliant, or legal for use on public roads unless explicitly stated.

Some products may remove, replace, relocate, disable, or alter emissions-related components, including but not limited to catalytic converters, EGR, DPF, SCR, DOC, O2 sensors, or related factory systems. Compatible tuning, calibration, or supporting modifications may be required to avoid engine codes or drivability issues.

Professional installation is recommended. Buyers are responsible for verifying product compatibility, local regulations, emissions requirements, and any required tuning or supporting modifications before purchase and installation.

Performance gains, sound changes, airflow improvements, temperature changes, fuel economy changes, fitment, and drivability results may vary. No specific performance gains are guaranteed.

Downpipe FAQs

What is a downpipe? +

A downpipe is the exhaust section that connects to the turbocharger and routes exhaust gases toward the rest of the exhaust system. Depending on the vehicle and product design, an upgraded downpipe may help reduce exhaust restriction and support improved turbo response when paired with the right setup.

What's the difference between catted and catless downpipes? +

A catted downpipe includes a catalytic converter, while a catless or racing downpipe does not include one and may alter or remove emissions-related equipment. Catless or racing downpipes are generally intended for off-road, racing, or closed-course use where emissions laws apply. Always check the product details and local regulations before purchase.

Will a downpipe increase horsepower? +

A downpipe may support improved exhaust flow and power potential when combined with proper tuning and supporting modifications. Horsepower and torque gains are not guaranteed and will vary depending on the vehicle, engine condition, tune, fuel, turbo setup, and overall exhaust system.

Do downpipes make the vehicle louder? +

A downpipe can change exhaust tone and may increase turbo or exhaust sound depending on the vehicle, whether the downpipe is catted or catless, and the rest of the exhaust system. Final sound level varies by setup.

Do I need tuning after installing a downpipe? +

Tuning requirements depend on the vehicle, downpipe design, emissions equipment, O2 sensor setup, and supporting modifications. Some applications may require compatible tuning or calibration to support drivability and reduce the chance of warning lights or engine codes.

Will a downpipe trigger a check engine light? +

It may, depending on the vehicle, catalytic converter configuration, O2 sensor location, and ECU calibration. Catless or racing downpipes are more likely to require supporting calibration or sensor-related solutions. Always verify the product notes and tuning requirements before installation.

Are downpipes street legal? +

Street legality depends on the downpipe design, emissions equipment, vehicle application, and local regulations. Catless, racing, or emissions-altering downpipes are generally intended for off-road, racing, or closed-course use where emissions laws apply and are not represented as street legal unless explicitly stated.

Can I use a downpipe with my stock exhaust system? +

Compatibility with a stock exhaust system depends on the vehicle and the specific downpipe design. Some downpipes are designed to connect to factory-style exhaust sections, while others may require compatible aftermarket exhaust parts, adapters, clamps, gaskets, or fabrication. Always check the product fitment and installation notes before ordering.

Are downpipes hard to install? +

Installation difficulty varies by vehicle. Some applications require tight access around the turbocharger, O2 sensors, heat shields, transmission area, or underbody. Rusted factory hardware and limited clearance can also increase installation difficulty. Professional installation is recommended.

Will a downpipe affect reliability? +

Reliability depends on product fitment, installation quality, tuning or calibration, heat management, sensor placement, gasket sealing, fastener condition, and the vehicle’s overall condition. Incorrect installation or mismatched tuning may cause drivability issues.

What should I verify before buying a downpipe? +

Verify your year, make, model, engine, turbo setup, emissions configuration, catalytic converter requirements, O2 sensor layout, flange or clamp connection, exhaust compatibility, and any tuning or calibration needs before purchase.