Rebate

Doug's Headers D6671 Full Length Header, 1-3/4 In, 79-93 Mustang, CC

Rebate

#447D6671

Doug's Headers D6671 Full Length Header, 1-3/4 In, 79-93 Mustang, CC

Name: Doug's Headers D6671 Full Length Header, 1-3/4 In, 79-93 Mustang, CC
Brand: Doug's Headers
SKU: 447D6671
Price: 1088.77 USD
Availability: InStock

Write a Review

2 Questions

$1,088.77

/set

Factory Shipped

$1,197.65

Save $108.88

Quantity

Need Help? Call to Order

Add to a list

Select a vehicle and engine to verify Fitment

Select Vehicle

Select Engine

Product Summary

Long Tube Header Tube Type, Standard Flange Style

Rebates Available

See rebate details

See more details

Key Specs

MFG. Part #	D6671
Header Tube Type	Long Tube
Flange Style	Standard
Primary Tube Diameter	1-3/4"
Material Type	Steel

See more specs

Need To Know

Need help?

855.313.9176

View the Help Center

Quick and Easy Returns

Return Policy

Doug's Headers D6671 Details

Doug's PASSENGER CAR HEADERS Long Tube Metallic Ceramic CoatedHeader development and design is complex and requires a substantial amount of time and resources to do the job right! Many manufacturers are unwilling to make the commitment and instead offer compromised headers at lower prices. Doug's will not compromise performance, quality or fit to compete with inferior designs at cheap prices. Every Doug's header is tuned with the proper tube size and length to efficiently remove all the exhaust from each cylinder, reducing pumping losses resulting in a dramatic increases in horsepower and torque. Doug's headers are carefully developed on the vehicles they are intended to fit and are re-checked numerous times during the design and manufacturing process.

3/8" Thick machined flanges... no warping
CNC mandrel bent tubes... accurate fit & better flow
Precision formed long transition collectors and long tube design... reduces backpressure and increases higher RPM horsepower
Heavy 16 gauge tubing... longer life
Tubes are pre-polished to remove scratches and the header isfinished with a Metallic Ceramic Thermal Barrier Coating polished to a high luster appearance offering corrosion and heat resistance up to 1400 degrees

Doug's Headers D6671 1 3/4" 4-Tube Full Length Header Ford Mustang Small Block Ford 79-93 Metallic Ceramic Coating
Long Tube Design - Ceramic Coated
Collector: 3
Primary: 1 3/4
exc. states w/Calif. emission stds
Fits Stock
GT40
Dart
Edelbrock and TFS Twisted Wedge Street Heads
Fits W/82 and up Lakewood scattershield
has fitting for O2 sensor
requires 86 or later double hump crossmember
with A/C
For Off-Road Use Only
with Floor Shifter

Doug's Headers D6671 1 3/4" 4-Tube Full Length Header Ford Mustang Small Block Ford 79-93 Metallic Ceramic Coating
Long Tube Design - Ceramic Coated
Collector: 3
Primary: 1 3/4
exc. states w/Calif. emission stds
Fits Stock
GT40
Dart
Edelbrock and TFS Twisted Wedge Street Heads
Fits W/82 and up Lakewood scattershield
has fitting for O2 sensor
requires 86 or later double hump crossmember
with A/C
For Off-Road Use Only
with Floor Shifter

Application

1980-1982 Ford Mustang 4.2L/255 V8

Charts

Installation Instructions (PDF)

Rebates

Aeromotive & PerTronix Black Friday 10% Off Sale

Black Friday Savings Are Here! From November 1 2026 through November 30 2026, save 10% on all Aeromotive and PerTronix products, including top performance brands like Doug's Headers, Taylor Cable, and JBA Performance Exhaust. Whether you're upgrading your fuel system, ignition components, headers, spark plug wires, or exhaust setup, this limited-time offer makes it easy to get premium performance parts at a great price. No coupon required, just shop qualifying Aeromotive and PerTronix brands and enjoy instant savings all month long.

Guides & Documents

Headers Installation Instructions (447D6671)

CARB Warning

For race/ off road use or for use on pre-1966 vehicles.

Emissions warning: this part only legal for sale or use in California for racing (competition) vehicles which may never be used, registered, or licensed for use upon a public highway, or if installed in vehicles model-year 1965 or older; motorcycles model-year 1977 or older; or off-highway recreational vehicles (such as off-road motorcycles and all-terrain vehicles) model-year 1996 and older. Any other use renders the vehicle tampered and not legal for use on California public highways (any public street or roadway, public dirt road, public park, or publicly maintained right of way open to the use of the public for vehicular travel). Violations subject to $37,500 penalty per violation per vehicle, revocation of registration, loss of use on California public right of ways, and proof of correction for tampering. There are similar restrictions and penalties under federal law and the laws of all other states with penalties under federal law of up to approximately $45,268 per tampered vehicle and/or engine.

CA WARNING:

Can expose you to lead, a carcinogen and reproductive toxicant. See www.P65Warnings.ca.gov

CARB warning

Doug's Headers D6671 Specifications

KEY SPECS
MFG. Part #	D6671
Brand	Doug's Headers
Header Tube Type	Long Tube
Flange Style	Standard
Primary Tube Diameter	1-3/4"
Material Type	Steel
Color	Silver
Weld-Up	No
Collector Diameter	3 Inch
Finish	Ceramic Coated
Hardware Included	Yes
Gasket(s) Included	Yes

GENERAL
Sold in Quantity	Pair
GTIN Code	694342510428

Ratings & Reviews

Be the first to write a review.

Questions & Answers

2 Questions • 2 Answers

Sort Questions

Will these work with AFR heads ?

by Salvatore

• 4 months ago

1 answer

View Answer

Will these work with a automatic transmission?

by Salvatore

• 4 months ago

1 answer

View Answer

2 of 2 questions shown

Fitment

1981-1982 Ford F-100

Ford 255

1980-1982 Ford Fairmont

Ford 255

1980-1981 Ford Granada

Ford 255

1981-1982 Ford LTD

Ford 255

1980-1982 Ford Mustang

Ford 255

1980-1982 Ford Thunderbird

Ford 255

1980-1982 Mercury Capri

Ford 255

1980-1982 Mercury Cougar

Ford 255

1981-1982 Mercury Grand Marquis

Ford 255

1981-1982 Mercury Marquis

Ford 255

1980 Mercury Monarch

Ford 255

1980-1982 Mercury Zephyr

Ford 255