Stainless Works 2004 GTO Headers 1-3/4in Primaries 3in High-Flow Cats (part # GTOHCAT), built from 304 stainless steel by Stainless Works in Streetsboro, Ohio.
304 Stainless Steel
TIG Welded
2004 Pontiac GTO
Lifetime Warranty
Made in USA
Overview
Improve the sound and performance on your 2004 Pontiac GTO with premium long tube headers from Stainless Works.
Designed specifically for the LS-powered GTO platform, these headers feature 1-3/4" CNC mandrel-bent primary tubes to increase airflow and unlock real horsepower gains.
Each system includes 3" slip-fit collectors and high-flow catalytic converters that transition into 3" lead pipes with a 2-bolt flange for factory exhaust compatibility.
Built from corrosion-resistant 304 stainless steel and TIG welded in Streetsboro, Ohio for long-term durability and performance.
Why Stainless Works
- American-made from raw material to finished product
- TIG welded by skilled craftsmen for strength and beauty
- Lifetime warranty on material and craftsmanship
- Direct bolt-on fit for 2004 Pontiac GTO
- Pairs perfectly with Stainless Works catback for a full system upgrade
Key Features
Long Tube Design
Maximizes exhaust scavenging for increased power.
1-3/4" Primary Tubes
Balanced design for strong overall performance.
Mandrel Bent Tubing
Smooth airflow with no restriction bends.
High-Flow Cats
EPA compliant with improved exhaust flow.
Slip-Fit Collectors
Easy installation and secure sealing.
TIG Welded Construction
Precision welds for maximum durability.
Specifications
| Vehicle Fitment |
2004 Pontiac GTO |
| Primary Tube Size |
1-3/4" |
| Collector Size |
3" Slip-Fit |
| Lead Pipe Size |
3" |
| Flange |
2-Bolt (Stock Exhaust Connection) |
| Material |
304 Stainless Steel |
| Welding |
TIG Welded |
| Catalytic Converters |
High-Flow EPA Compliant |
| Connection |
Factory Connection Point - Fits Stainless Works and most Aftermarket Exhausts |
| Lead Time |
Built To Order — 4 Weeks |
| Warranty |
Lifetime |
| Origin |
Made in USA — Streetsboro, Ohio |
⇩ Download Installation Instructions (PDF)
Frequently Asked Questions
Will this fit my 2004 Pontiac GTO?
Yes. This system is designed specifically for the 2004 GTO with factory-style installation.
Do these improve performance?
Yes. These long tube headers significantly improve exhaust flow and increase power output.
Can I reuse my factory exhaust?
Yes. The 2-bolt flange allows direct connection to the stock exhaust system.
Do these work with Stainless Works catbacks?
Yes. They are designed to pair perfectly with Stainless Works catback systems.
Questions? Call us at
Built To Order in 4 Weeks — Free Shipping on Orders $50+
This Listing
- Brand: Stainless Works
- Part number: GTOHCAT
- Product type: Headers
- Fitment: 2004 Pontiac GTO
- Configuration: High-Flow Cats
- EPA status: Testing
- Shipping weight: 57 lb
California Prop 65 warning applies to this product.
Emissions note: headers, downpipes and catless/high-flow pipes may not be legal for street use in all states. Check your local emissions laws before installing.
Fitment note: Stainless Works systems are application-specific (year, cab/bed, transmission and factory exhaust). Send us your VIN before ordering and we will confirm fitment: 954-507-6261 or sales@americanmuscleperformance.net.
