2002-2006 Nissan Altima 2.5L QR25DE Stainless Steel 4-1 Exhaust Header
T304 stainless steel tubular exhaust manifold and performance header for the Nissan Altima L31 chassis equipped with the 2.5L QR25DE 4-cylinder engine.
IMPORTANT: 2.5L QR25DE ENGINE ONLY
Fits listed 2002-2006 Nissan Altima 2.5L 4-cylinder applications with the QR25DE engine. Does not fit the 3.5L V6 Altima SE or SE-R. Verify engine, exhaust connection, emissions equipment, and vehicle configuration before ordering. This performance header is not represented as a direct replacement for every factory emissions component.
NISSAN ALTIMA QR25DE HEADER SPECIFICATIONS
2002-2006 NISSAN ALTIMA 2.5 PERFORMANCE EXHAUST HEADER
The SSAutoChrome 2002-2006 Nissan Altima 2.5L stainless steel exhaust header is a tubular performance exhaust manifold designed for compatible L31 Altima models equipped with the QR25DE 4-cylinder engine.
This aftermarket Nissan Altima header uses a 4-into-1 exhaust runner configuration that combines exhaust flow from the four engine cylinders into a single 2.50-inch outlet. The tubular construction provides an alternative to the factory exhaust manifold arrangement for compatible performance exhaust applications.
Manufactured from T304 stainless steel, the header features TIG-welded construction and a CNC-machined mounting flange. It is intended for owners looking for a Nissan QR25DE performance header, stainless steel exhaust manifold replacement for a compatible modified setup, or a component for a custom Altima exhaust project.
Whether you are refreshing an older 2.5L Altima exhaust system or assembling a custom naturally aspirated QR25DE performance setup, correct header fitment and exhaust system compatibility are essential.
STAINLESS STEEL HEADER FEATURES
Stainless steel tubular construction for automotive exhaust applications, with resistance to corrosion under appropriate service conditions.
Four individual exhaust runners merge into a single outlet in a performance-oriented tubular header configuration.
Specified outlet size for planning downstream exhaust connections and checking compatibility with the vehicle exhaust system.
Welded stainless steel runner assembly with a CNC-machined mounting flange.
Designed for listed Nissan Altima 2.5L 4-cylinder applications, not the 3.5L V6 engine.
A metal gasket is included. Additional hardware is included only where shown in the product photographs.
DETAILED TECHNICAL SPECIFICATIONS
| Product Type | Tubular Exhaust Manifold / Performance Header |
|---|---|
| Vehicle | Nissan Altima |
| Chassis | L31 |
| Model Years | 2002-2006 |
| Engine | QR25DE 2.5L Inline-4 |
| Material | T304 Stainless Steel |
| Header Layout | 4-1 / 4-Into-1 |
| Specified Inlet | 2.00" x 1.25" Rectangular |
| Outlet | 2.50" |
| Welding | TIG Welded |
| Flange | CNC-Machined Flange |
| Condition | Brand New |
| Installation | Professional Installation Recommended |
NISSAN ALTIMA 2.5L VEHICLE FITMENT
Intended for the following Nissan Altima L31 applications equipped with the 2.5L QR25DE inline-four engine:
| YEAR | MODEL | ENGINE |
|---|---|---|
| 2002 | Altima Base / S / SL | 2.5L QR25DE |
| 2003 | Altima Base / S / SL | 2.5L QR25DE |
| 2004 | Altima Base / S / SL | 2.5L QR25DE |
| 2005 | Altima Base / S / SL | 2.5L QR25DE |
| 2006 | Altima Base / S / SL | 2.5L QR25DE |
Trim availability varies by model year. Verify the 2.5L QR25DE engine and existing exhaust configuration. The 3.5L V6 is excluded.
DOES NOT FIT
- Nissan Altima 3.5L V6 engine applications
- Altima SE-R 3.5L V6
- Altima SE models equipped with the 3.5L V6
- Other Nissan models without separately confirmed fitment
4-1 TUBULAR HEADER DESIGN FOR THE QR25DE
The QR25DE is a 2.5-liter, four-cylinder Nissan engine used in the L31-generation Altima. A 4-1 tubular header routes exhaust from the four cylinders through individual runners before merging into a single outlet.
Header geometry, runner design, exhaust system configuration and engine calibration all influence exhaust flow and performance. This product uses a 4-1 configuration with a specified 2.50-inch outlet, making those dimensions important when planning a compatible aftermarket exhaust installation.
Actual horsepower, torque, exhaust sound and throttle response changes depend on the complete vehicle setup. No specific horsepower gain is guaranteed.
PACKAGE CONTENTS
- 1 x Nissan Altima 2.5L QR25DE stainless steel tubular exhaust header
- Metal exhaust gasket
- Additional gaskets or mounting hardware only if shown in the actual product photographs
Installation instructions are not included. Confirm the supplied components against the product photographs before ordering.
INSTALLATION AND EXHAUST SYSTEM COMPATIBILITY
- Verify your Nissan Altima is equipped with the 2.5L QR25DE engine.
- Compare the header mounting flange and downstream exhaust connection with the existing system.
- Confirm oxygen sensor provisions, catalytic converter requirements and applicable emissions regulations before installation.
- Inspect the supplied gasket and all mating surfaces before assembly.
- Follow the appropriate Nissan service procedures and torque specifications.
- Check exhaust connections and nearby components for clearance and leakage after installation.
FREQUENTLY ASKED QUESTIONS
Does this header fit a 2002 Nissan Altima 2.5S?
It is listed for the 2002 Nissan Altima 2.5L QR25DE application. Confirm the engine and exhaust connection before ordering.
Will it fit a 2005 Nissan Altima 2.5 SL?
The 2005 Altima 2.5L QR25DE is included in the stated application range. Verify the vehicle's existing exhaust and emissions configuration.
Is this a 4-1 or 4-2-1 exhaust header?
This product is specified as a 4-into-1 tubular exhaust header.
Is the header made of stainless steel?
Yes. The supplied product specifications identify T304 stainless steel construction.
What is the exhaust outlet diameter?
The specified header outlet measures 2.50 inches.
Does it fit the Altima 3.5L V6 or SE-R?
No. This header is intended for the 2.5L QR25DE 4-cylinder engine and is not listed for 3.5L V6 models.
How much horsepower will this Nissan Altima header add?
Actual results vary with engine condition, exhaust configuration, tuning and other modifications. A specific horsepower or torque increase is not guaranteed.
Is this a direct bolt-on replacement for the factory catalytic converter?
Direct compatibility with every original catalytic converter and emissions configuration has not been confirmed. Check the original system and applicable regulations before installation.
Does the header include a gasket?
Yes. A metal gasket is included. Any additional hardware should be confirmed from the product photographs.
NISSAN ALTIMA 2.5L EXHAUST HEADER AND MANIFOLD APPLICATIONS
This SSAutoChrome stainless steel header is listed for owners searching for a 2002 Nissan Altima 2.5 header, 2003 Altima QR25DE exhaust manifold, 2004 Nissan Altima stainless steel header, 2005 Altima 2.5 performance header, or 2006 Nissan Altima 4-cylinder exhaust header.
The product is also relevant to compatible Nissan L31 QR25DE exhaust projects requiring a 4-1 tubular manifold design, TIG-welded stainless steel construction, a CNC-machined flange and a 2.50-inch exhaust outlet.
SSAUTOCHROME NISSAN ALTIMA 2.5L QR25DE EXHAUST HEADER
T304 stainless steel 4-1 tubular exhaust header for listed 2002-2006 Nissan Altima L31 2.5L QR25DE applications.
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