Exhaust Header for 2002-2006 Acura RSX DC5/2002-2005 Honda Civic Si/SiR 2.0L L4 DC5 EP3 K20A3

SKU: XKV11137
Availability : In Stock Pre order Out of stock
$107.09 $78.53 SAVE $28.56
Fitment & Specs
Fits selected 2002–2006 Acura RSX Non-Type S and 2002–2005 Honda Civic Si / SiR 2.0L K20A3 applications. Does not fit 2003 Honda Civic Si 2.0L. Verify model year, chassis, engine, trim, and exhaust connection before purchase.
1.75" Inlet · 2.5" Outlet
T304 Stainless Steel · Shorty Exhaust Header
Before You Buy: Off-road/racing use only · Professional install recommended
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Description

This stainless steel exhaust header is designed for listed 2002–2006 Acura RSX Non-Type S and 2002–2005 Honda Civic Si / SiR 2.0L K20A3 applications. It is intended as an exhaust manifold / header replacement or upgrade-style component for compatible DC5 / EP3 K20A3 exhaust setups.

Built from T304 stainless steel with computerized mandrel-bent tubing, CNC-machined flanges, TIG/MIG welded construction, 1.75" inlet, 2.5" collector outlet, 16-gauge pipe thickness, and shorty-style routing as listed, this header is designed to support a secure exhaust path where compatible. Final fitment, sound, exhaust sealing, drivability, and performance results may vary depending on vehicle condition, trim, engine code, exhaust layout, O2 sensor setup, installation quality, emissions setup, and supporting components.

Product Overview

This product is an exhaust header for compatible Acura RSX Non-Type S and Honda Civic Si / SiR K20A3 applications. It is not an RSX Type-S header, K20Z3 Civic Si header, catback exhaust system, downpipe, turbo manifold, full exhaust system, or universal header kit. Please verify your exact model year, trim, engine code, chassis, flange layout, O2 sensor position, downstream exhaust connection, and emissions requirements before purchase.

Key Details

  • Fitment: Listed 2002–2006 Acura RSX Non-Type S and 2002–2005 Honda Civic Si / SiR applications
  • Engine: 2.0L K20A3 as listed
  • Chassis Reference: DC5 / EP3 applications as listed
  • Product Type: Shorty Exhaust Header / Exhaust Manifold Header
  • Material: T304 stainless steel as listed
  • Inlet: 1.75" as listed
  • Outlet / Collector: 2.5" collector diameter as listed
  • Piping Reference: 4 x 1.75" manifold piping into 1 x 2.50" major pipe as listed
  • Head Flange Thickness: 3/8" as listed
  • Pipe Thickness: 16 gauge / 1.5mm as listed
  • Construction: Computerized mandrel-bent tubing with TIG/MIG welded CNC-machined flanges as listed
  • Installation: Professional installation highly recommended
  • Instruction: No installation instructions included
  • Use Case: Off-road, racing, or closed-course use where emissions laws apply

Fitment

Please use the table below to quickly confirm the main vehicle applications listed for this header. Before ordering, verify your exact model year, trim, engine code, chassis, exhaust layout, O2 sensor position, and emissions setup.

Vehicle Name Year Engine Notes
Acura RSX Non-Type S 2002–2006 2.0L K20A3 Verify Non-Type S trim, DC5 chassis, flange layout, O2 sensor position, and exhaust connection
Honda Civic Si / SiR 2002–2005 2.0L K20A3 Verify EP3 / listed chassis fitment; page-listed fitment excludes 2003 Honda Civic Si 2.0L
Fitment Note: This table is based on the fitment information currently listed for this product. This header is listed for 2002–2006 Acura RSX Non-Type S and 2002–2005 Honda Civic Si / SiR 2.0L K20A3 applications. The current product page specifically excludes 2003 Honda Civic Si 2.0L. Please verify your exact trim, engine code, chassis, flange layout, O2 sensor position, downstream exhaust connection, and emissions setup before purchase.

Package Includes

  • Shorty exhaust header component as shown
  • CNC-machined flange sections as listed
  • Gaskets, hardware, bolts, or additional accessories included only if shown or listed

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

Installation Notes

  • Professional installation is highly recommended.
  • No installation instructions are included.
  • Test fit the header before final tightening.
  • Verify cylinder head flange alignment, gasket seating, O2 sensor position, downstream exhaust connection, and engine bay clearance before installation.
  • Check clearance around the engine bay, subframe, steering components, wiring, heat shields, sensors, and surrounding exhaust components.
  • Old, rusted, or seized factory hardware may increase installation difficulty.
  • Modified exhaust systems, previous repairs, engine swaps, or non-factory configurations may require additional adjustment or compatible components.
  • 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 listed Acura RSX Non-Type S and Honda Civic Si / SiR K20A3 applications only.
  • This is a shorty exhaust header, not an RSX Type-S header, K20Z3 Civic Si header, catback exhaust system, downpipe, turbo manifold, full exhaust system, or universal header kit.
  • Please verify your exact model year, trim, engine code, chassis, flange layout, O2 sensor position, downstream exhaust connection, and emissions setup before purchase.
  • The current product page lists an exclusion for 2003 Honda Civic Si 2.0L. Please verify this application before ordering.
  • This product may alter the factory exhaust or emissions-related configuration depending on the vehicle setup.
  • This product is intended for off-road, racing, 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, clearance, 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.

What Does an Exhaust Header Actually Do?

The exhaust header is the first section of the exhaust system and mounts directly to the engine. Its role is to collect exhaust gases from each cylinder and route them into the rest of the exhaust system.

Compared to many factory manifolds, header designs often focus on smoother internal flow and more uniform exhaust routing before gases move downstream.

What You May Notice After Installation

Smoother exhaust flow as engine speed increases

More consistent engine behavior across the RPM range

Improved exhaust routing when paired with other intake or exhaust components

Changes in exhaust tone, depending on system configuration

When This Type of Upgrade Is Typically Considered

Addressing airflow limitations in the factory exhaust manifold

Planning coordinated intake or exhaust system updates

Replacing aging or restrictive original components

Build a balanced, performance-focused setup

Factory Manifold vs. Performance Header

Factory Exhaust Manifold

Designed to meet packaging, cost, and emissions requirements
Prioritizes durability and compliance across broad use cases

Performance Exhaust Header

Designed with exhaust flow characteristics in mind
Built for higher exhaust temperatures and specific vehicle platforms
Commonly used as part of an exhaust system configuration

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.

Frequently Asked Questions

What do exhaust headers do? +
Exhaust headers help route exhaust gases away from the engine through individual tubes and collector-style routing. Actual results depend on the vehicle, engine condition, exhaust system, installation quality, and supporting components.
What's the difference between headers and factory manifolds? +
Factory manifolds are typically designed around packaging, durability, emissions requirements, and production cost. Headers or manifold-related exhaust upgrades may use different tube routing, flange designs, or connection layouts depending on the application.
Will headers increase horsepower? +
Headers may support improved exhaust flow where the product is compatible, but horsepower and torque changes are not guaranteed. Results vary by engine setup, tuning, exhaust configuration, vehicle condition, installation, and supporting modifications.
Do headers make the vehicle louder? +
Headers and related exhaust parts can change exhaust tone and may increase sound depending on the rest of the exhaust system. Final sound level depends on the engine, mufflers, catalytic converters, pipe routing, and complete exhaust setup.
Do I need tuning after installing headers? +
Tuning requirements depend on the vehicle, engine management system, O2 sensor setup, emissions equipment, and supporting modifications. Some installations may not require tuning, while modified builds may require professional inspection, calibration, or tuning to support proper drivability.
Are header products street legal? +
Header and exhaust products may be intended for off-road or racing use where emissions laws apply. They are not represented as street legal, emissions-compliant, or CARB-compliant for public road use unless a valid exemption is explicitly stated. Always check local regulations before purchase and installation.
Can I use headers with a stock exhaust system? +
Compatibility with a stock exhaust system depends on the vehicle and existing exhaust configuration. Some vehicles may require additional hardware, gaskets, connectors, adjustment, or fabrication to complete installation.
Are headers hard to install? +
Installation difficulty varies by vehicle. Tight engine bays, old hardware, rust, engine swaps, modified exhaust systems, sensor placement, and clearance around surrounding components can increase installation complexity. Professional installation is recommended.
Will headers affect reliability? +
Reliability depends on fitment accuracy, installation quality, vehicle condition, heat management, gasket sealing, fastener condition, sensor placement, and supporting components. Proper inspection and installation are important.