Stainless Works 2003-11 Crown Victoria/Grand Marquis 4.6L Headers 1-5/8in Primaries 3in H-Flow Cats (part # CRVIC03HCAT), built from 304 stainless steel by Stainless Works in Streetsboro, Ohio.
304 Stainless Steel
TIG Welded
2003–11 Crown Victoria
Long Tube Headers
Factory Connect
Made in USA
Overview
Improve the sound and performance of your 2003–11 Crown Victoria or Grand Marquis 4.6L 2V with premium long tube headers from Stainless Works. All tubes are CNC mandrel bent for optimal flow and made from 304 stainless steel for maximum corrosion resistance.
Starting with CNC cut 3/8" thick flanges into 1-5/8" diameter primaries with 3" slip-fit collectors and 2-1/2" diameter catted lead pipes to fit the flanged factory connection point. This system is designed to connect seamlessly to your factory exhaust.
Built from corrosion-resistant 304 stainless steel and fully TIG welded for strength and durability — engineered for long-term 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 2003–11 Crown Victoria / Grand Marquis 4.6L 2V
- Factory Connection design for easy installation
Key Features
1-5/8" Primary Tubes
Optimized sizing for strong low-end torque and mid-range power.
3" Slip-Fit Collectors
Smooth-flow collectors improve exhaust scavenging and performance.
High-Flow Catalytic Converters
EPA compliance with improved flow for maximum performance.
Factory Connection Point
2-1/2" catted lead pipes fit the flanged factory connection.
Mandrel Bent Tubing
Smooth airflow with zero restriction bends.
TIG Welded Construction
Precision welds for maximum durability.
Specifications
| Vehicle Fitment |
2003–11 Crown Victoria / Grand Marquis 4.6L 2V |
| System Type |
Long Tube Header Kit |
| Primary Tube Size |
1-5/8" |
| Collector Size |
3" Slip-Fit |
| Lead Pipe Size |
2-1/2" Catted Lead Pipes |
| Flange Thickness |
3/8" CNC Cut |
| Catalytic Converters |
EPA Compliant High-Flow |
| Connection |
Factory Connection Point — Flanged |
| Material |
304 Stainless Steel |
| Welding |
TIG Welded |
| Warranty |
Lifetime |
| Origin |
Made in USA |
⇩ Download Installation Instructions (PDF)
See It In Action
Sound Comparison and Features — 2003–11 Crown Victoria Long Tube Header System
What's In The Box
- Driver & Passenger Side Headers x2
- Catalytic Converters x2
- Lead Pipes x2
- AccuSeal Clamps x4
- O2 Extensions x2
- Bolt Kit — 16 Pieces
- RTV Tube
- Installation Instructions
Frequently Asked Questions
Will these headers fit my 2003–11 Crown Victoria or Grand Marquis?
Yes. These long tube headers are designed specifically for the 2003–2011 Crown Victoria and Grand Marquis with the 4.6L 2V engine. They are a direct bolt-on kit designed to connect to the factory exhaust with no cutting or modification required.
What are the benefits of upgrading to these headers?
These headers feature 1-5/8" primary tubes with 3/8" thick CNC cut flanges and 3" slip-fit collectors. They significantly improve exhaust flow for increased horsepower and torque, while delivering a more aggressive exhaust tone.
Do these headers include catalytic converters?
Yes. This system includes high-flow catalytic converters that are EPA compliant and designed for improved flow while maintaining emissions compliance. The 2-1/2" catted lead pipes fit the flanged factory connection point.
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: CRVIC03HCAT
- Product type: Headers
- Fitment: 2003-11 Crown Victoria/Grand Marquis 4.6L
- Configuration: High-Flow Cats
- EPA status: Testing
- Shipping weight: 50.7 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.
