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Doug's Headers D670S4 Full Length Header, 1-3/4 In, 67-70 Mustang, CC

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#447D670S4

Doug's Headers D670S4 Full Length Header, 1-3/4 In, 67-70 Mustang, CC

Name: Doug's Headers D670S4 Full Length Header, 1-3/4 In, 67-70 Mustang, CC
Brand: Doug's Headers
SKU: 447D670S4
Price: 979.89 USD
Availability: InStock

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Finish:

Ceramic Coated

Painted

$979.89

/set

Factory Shipped

$1,088.77

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Product Summary

Long Tube Header Tube Type, Standard Flange Style

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Key Specs

MFG. Part #	D670S4
Header Tube Type	Long Tube
Flange Style	Standard
Primary Tube Diameter	1-3/4"
Material Type	Steel

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Need To Know

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855.313.9176

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Doug's Headers D670S4 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 D670S4 1 3/4" 4-Tube Full Length Header Ford Mustang 351C 67-70 Metallic Ceramic Coating

Doug's Headers D670S4 1 3/4" 4-Tube Full Length Header Ford Mustang 351C 67-70 Metallic Ceramic Coating

Charts

Installation Instructions (PDF)

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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 (447D670S4)

CARB Warning

For use on pre-1966 vehicles only

Emissions warning: this part only legal for sale or use in California 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 D670S4 Specifications

KEY SPECS
MFG. Part #	D670S4
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	2-1/2 Inch
Finish	Ceramic Coated
Hardware Included	Yes
Gasket(s) Included	Yes

GENERAL
Sold in Quantity	Pair
GTIN Code	694342510787

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Fitment

1971-1974 DeTomaso Pantera

351C Ford 335 Series Cleveland V8

1981-1987 DeTomaso Pantera

351C Ford 335 Series Cleveland V8

1970-1974 Ford Country Sedan

351C Ford 335 Series Cleveland V8

1970-1974 Ford Country Squire

351C Ford 335 Series Cleveland V8

1970-1972 Ford Custom

351C Ford 335 Series Cleveland V8

1970-1974 Ford Custom 500

351C Ford 335 Series Cleveland V8

1970 Ford Fairlane

351C Ford 335 Series Cleveland V8

1970 Ford Falcon

351C Ford 335 Series Cleveland V8

1970-1974 Ford Galaxie 500

351C Ford 335 Series Cleveland V8

1972-1974 Ford Gran Torino

351C Ford 335 Series Cleveland V8

1970-1974 Ford LTD

351C Ford 335 Series Cleveland V8

1970-1973 Ford Mustang

351C Ford 335 Series Cleveland V8

1970-1974 Ford Ranch Wagon

351C Ford 335 Series Cleveland V8

1970-1974 Ford Ranchero

351C Ford 335 Series Cleveland V8

1970-1974 Ford Torino

351C Ford 335 Series Cleveland V8

1972 Mercury Cougar

Ford 335 Series Cleveland V8 351C Cobra Jet
Ford 335 Series Cleveland V8 351C Boss