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Choose the Right Header for Your Acura Integra
The most important step is matching the header to the engine and trim. The products in this collection cover two main groups: LS, RS, and GS models using the B18B1 non-VTEC engine, and GSR or Type R models using a B18C-series DOHC VTEC engine. A part that bolts to a B-series cylinder head is not automatically compatible with every B-series Integra.
Header length, collector location, catalytic-converter position, and underbody clearance may differ between applications. Engine-swapped cars and vehicles with custom exhaust work require additional measurements before a fitment decision can be made.
Before You Buy
- Confirm the model year, trim, and engine code on the vehicle.
- Check whether the existing exhaust and catalytic converter are still in their original locations.
- Compare the header outlet and flange orientation with the current exhaust connection.
- Verify the number and location of the required O2 sensor ports.
- Contact Flashark before ordering if the car has an engine swap, custom mid-pipe, or relocated catalytic converter.
Compare the Available Integra Header Applications
| Application | Engine | Header Information | What to Check |
|---|---|---|---|
| 1994–2001 Integra LS, RS, and GS | B18B1 1.8L DOHC non-VTEC | Stainless steel header with a listed 2.5-inch outlet | Confirm the current header layout, collector position, O2 sensor provision, and downstream flange before ordering. |
| 1994–2001 Integra GSR and 1997–2001 Integra Type R | B18C1 or B18C5 DOHC VTEC | 4-2-1 Tri-Y design with a listed 2.5-inch outlet and O2 sensor provision | Confirm the exact year, catalytic-converter location, collector orientation, and whether downstream exhaust adjustment may be required. |
Header Design and Driving Characteristics
A 4-2-1, or Tri-Y, header merges four primary tubes into two secondary tubes before they meet at a single collector. This layout is commonly selected for a broad, street-friendly powerband rather than concentrating only on peak-RPM operation. The actual result still depends on the engine, intake, catalytic converter, exhaust system, ECU calibration, and overall condition of the vehicle.
No fixed horsepower or torque increase should be assumed from the header alone. Without testing the exact vehicle before and after installation, it is more accurate to expect a possible change in exhaust response and sound rather than a guaranteed performance figure.
Collector and Exhaust Connection
The listed outlet diameter is only one part of the connection. The flange shape, bolt pattern, angle, overall header length, and collector location must also align with the catalytic converter or front section of the exhaust. Two headers with the same outlet diameter can still require different gaskets, hardware, adapters, or exhaust work.
This is especially important when comparing LS, RS, or GS applications with GSR and Type R applications. Do not assume the factory catalytic converter or mid-pipe will connect solely because the engine belongs to the B-series family.
O2 Sensors, Catalytic Converters, and Check Engine Lights
An O2 sensor port allows a sensor to be installed, but it does not guarantee that the original sensor position, wiring reach, or ECU readings will remain unchanged. Exhaust leaks, a relocated sensor, altered catalytic-converter placement, or an aging sensor may contribute to a check engine light.
Confirm whether the selected header retains the original catalytic converter and sensor arrangement. If the installation changes emissions-related equipment, check the rules that apply where the vehicle will be registered or driven. No product on this page should be treated as emissions-approved unless product-specific documentation states that approval.
Chassis Clearance and Installation
Before final installation, check clearance around the crossmember, oil pan, engine mounts, heat shields, and nearby wiring or hoses. Adequate space should remain as the engine moves under load. A header that sits too close to the chassis can create rattles, heat exposure, or stress at the flange and collector.
Use new, application-correct gaskets and inspect the mounting surfaces before assembly. Tighten hardware evenly and recheck it after the first complete heat cycles. If the collector does not meet the exhaust without being forced into position, stop and confirm the application instead of using the fasteners to pull the parts together.
Technician’s Note
As a general installation rule, matching the cylinder-head flange is not enough to confirm complete fitment. The header must also clear the chassis and place its collector where the vehicle’s catalytic converter or mid-pipe can connect without excessive tension. For a modified or engine-swapped Integra, compare physical measurements and flange orientation before purchase.
Does an Integra Header Require a Tune?
A tune should not be presented as universally required or unnecessary. The answer depends on the engine, ECU, O2 sensor arrangement, catalytic-converter configuration, and other intake or exhaust changes. A largely stock vehicle may operate differently from an engine-swapped or heavily modified build. Consult a qualified tuner when airflow changes are substantial or fuel-trim and sensor behavior are uncertain.
Frequently Asked Questions
Q1: Which header fits a 1994–2001 Integra LS, RS, or GS?
A1: Choose the product listed for the B18B1 1.8L engine, then confirm the vehicle’s year, trim, engine code, collector position, and existing exhaust connection. Modified exhaust systems may require additional measurement or fabrication.
Q2: Which header fits an Integra GSR or Type R?
A2: The Tri-Y product is listed for 1994–2001 Integra GSR models with the B18C1 engine and 1997–2001 Type R models with the B18C5 engine. Verify the exact year and downstream exhaust connection before ordering.
Q3: Are B18B1 and B18C Integra headers interchangeable?
A3: Do not assume they are interchangeable. Even when cylinder-head flange patterns are similar, header length, chassis clearance, collector position, and catalytic-converter connections can differ between B18B1 and B18C applications.
Q4: Will these headers connect to the factory catalytic converter?
A4: Compatibility depends on the selected header, model year, trim, collector location, flange orientation, and whether the exhaust remains factory configured. Compare the product connection with the vehicle before purchase; an adapter or exhaust work may be required in some configurations.
Q5: Do these Integra headers include an O2 sensor port?
A5: The GSR and Type R Tri-Y header is listed with an O2 sensor provision. The exact O2 provision for the LS, RS, and GS header should be confirmed on the product page or with Flashark before ordering.
Q6: Can installing an Integra header cause a check engine light?
A6: It can. O2 sensor position, catalytic-converter changes, exhaust leaks, wiring reach, sensor condition, and ECU calibration can all affect fault monitoring. An O2 sensor port alone does not guarantee that a check engine light will not occur.
Q7: Is an ECU tune required after installing a header?
A7: Not in every configuration, but the need for tuning depends on the engine, ECU, sensor layout, catalytic-converter setup, and other airflow modifications. Seek professional calibration advice for an engine-swapped or substantially modified Integra.
Q8: What should I measure before ordering an Integra header?
A8: Confirm the engine code and measure or photograph the existing collector location, outlet diameter, flange shape, bolt pattern, and catalytic-converter connection. Also check the number and location of the O2 sensors and note any non-factory exhaust components.
Q9: Will a header change the sound of my Integra?
A9: A header may make the exhaust note more noticeable or change its tone, but the result depends on the catalytic converter, resonator, muffler, pipe diameter, engine setup, and header design. No specific sound level can be guaranteed.
Q10: Can I use these headers on an engine-swapped Integra?
A10: Fitment on an engine-swapped Integra is not confirmed by engine family alone. Mount position, crossmember clearance, oil-pan clearance, collector location, O2 sensor routing, and the downstream exhaust must all be checked before purchase.