Stainless Works 2005-06 GTO Headers 1-3/4in Primaries 3in High-Flow Cats (part # 05GTOHCAT), built from 304 stainless steel by Stainless Works in Streetsboro, Ohio.
304 Stainless Steel
TIG Welded
2005–2006 Pontiac GTO
Lifetime Warranty
Made in USA
Overview
Improve the sound and performance of your 2005–2006 Pontiac GTO with premium long tube headers from Stainless Works.
Designed with 1-3/4" CNC mandrel-bent primary tubes, these headers are engineered to increase airflow and unlock horsepower and torque gains for your LS-powered GTO.
Each system includes 3" slip-fit collectors and high-flow catalytic converters that transition into 3" lead pipes with a 2-bolt flange for direct connection to the stock exhaust system.
Built from corrosion-resistant 304 stainless steel and TIG welded in Streetsboro, Ohio — engineered 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 2005–2006 Pontiac GTO
- Pairs perfectly with Stainless Works catback for a full system upgrade
Key Features
Long Tube Design
Improves exhaust scavenging for more power and torque.
1-3/4" Primary Tubes
Optimized sizing for strong all-around performance gains.
Mandrel Bent Tubing
Smooth airflow with zero restriction bends.
High-Flow Cats
EPA compliance with improved exhaust flow.
Slip-Fit Collectors
Simplifies installation and improves exhaust sealing.
TIG Welded Construction
Precision welds for maximum durability.
Specifications
| Vehicle Fitment |
2005–2006 Pontiac GTO |
| Primary Tube Size |
1-3/4" |
| Collector Size |
3" Slip-Fit |
| Lead Pipe Size |
3" |
| Flange |
2-Bolt Flange (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)
See It In Action
Sound Comparison and Features — 2005–2006 Pontiac GTO Long Tube Header Kit
Frequently Asked Questions
Will these headers fit my 2005–2006 Pontiac GTO?
Yes. These headers are designed specifically for the 2005–2006 Pontiac GTO and install using factory-style connections.
Do these connect to the stock exhaust?
Yes. The included 2-bolt flange allows direct connection to the stock exhaust system or compatible aftermarket setups.
Do these headers include catalytic converters?
Yes. High-flow catalytic converters are included and designed to improve flow while maintaining emissions compliance.
Will this work with Stainless Works catback exhaust?
Yes. This header kit pairs perfectly with Stainless Works catback systems for a full performance exhaust upgrade.
What warranty is included?
Stainless Works provides a lifetime warranty on material and craftsmanship — covering the full life of the product, not just a limited term.
Questions? Call us at | Mon–Fri 7:30am–4:30pm EST
Built To Order in 4 Weeks — Free Shipping on Orders $50+
This Listing
- Brand: Stainless Works
- Part number: 05GTOHCAT
- Product type: Headers
- Fitment: 2005-06 GTO
- Configuration: High-Flow Cats
- EPA status: Testing
- Shipping weight: 56 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.
