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Doug's Headers D3373-B Replacement Header, 1-5/8 In, 02-07 Chevy Truck

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#447D3373B

Doug's Headers D3373-B Replacement Header, 1-5/8 In, 02-07 Chevy Truck

Name: Doug's Headers D3373-B Replacement Header, 1-5/8 In, 02-07 Chevy Truck
Brand: Doug's Headers
SKU: 447D3373B
Price: 528.73 USD
Availability: InStock

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Finish:

Painted

Ceramic Coated

$528.73

/set

Factory Shipped

$581.60

Save $52.87

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Product Summary

Shorty Header Tube Type, Round Exhaust Port Shape

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Key Specs

MFG. Part #	D3373-B
Header Tube Type	Shorty
Exhaust Port Shape	Round
Flange Style	Standard
Primary Tube Diameter	1-5/8"

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Need To Know

Need help?

855.313.9176

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Doug's Headers D3373-B Details

Doug's 2/4 WD TRUCK HEADERS Long Tube Hi-Temp Black 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 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 Hi-Temp Black Coating

Doug's Headers D3373-B 1 5/8" 4-Tube Manifold Replacement Header Chevrolet Truck 5.3L 02-07 Hi-Temp Black Coating

Doug's Headers D3373-B 1 5/8" 4-Tube Manifold Replacement Header Chevrolet Truck 5.3L 02-07 Hi-Temp Black Coating

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 (447D3373B)

CA WARNING:

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

CARB warning

Doug's Headers D3373-B Specifications

D-57-33

KEY SPECS
MFG. Part #	D3373-B
Brand	Doug's Headers
Header Tube Type	Shorty
Exhaust Port Shape	Round
Flange Style	Standard
Primary Tube Diameter	1-5/8"
Material Type	Steel
Color	Black
Weld-Up	No
Collector Diameter	2-1/2 Inch
Finish	Hi-Temp Black
Hardware Included	Yes
Gasket(s) Included	Yes
CARB EO#

GENERAL
Sold in Quantity	Pair
GTIN Code	694342543624

Ratings & Reviews

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Fitment

2004 Buick Rainier

GM LM4

2006-2007 Cadillac CTS

GM LS2

2009-2014 Cadillac CTS

GM LSA

2002-2011 Cadillac Escalade

GM LM7
GM LQ9

2012 Cadillac Escalade

6.2 Chevy LS V8

2003-2006 Cadillac Escalade ESV

GM LM7
GM LQ9

2007-2012 Cadillac Escalade ESV

6.2 Chevy LS V8

2002-2006 Cadillac Escalade EXT

GM LM7
GM LQ9

2007-2012 Cadillac Escalade EXT

6.2 Chevy LS V8

2007-2011 Chevy Avalanche

GM L76
GM LC9
GM LMG
GM LY5

2012-2013 Chevy Avalanche

GM LY5

2002-2006 Chevy Avalanche 1500

GM LM7

2000-2002 Chevy C1500

4.8 Chevy LS V8
GM LM7
GM LQ4

2010-2014 Chevy Camaro

GM LS3

2005-2007 Chevy Corvette

GM LS2

2008-2013 Chevy Corvette

GM LS3

1999 Chevy Silverado 1500

4.8 Chevy LS V8
GM LM7

2000-2011 Chevy Silverado 1500

4.8 Chevy LS V8
GM L20
GM LM7
GM LY2

2012-2014 Chevy Silverado 1500

4.8 Chevy LS V8
GM LM7

2007 Chevy Silverado 1500 Classic

GM LQ4

2001-2003 Chevy Silverado 1500 HD

GM LQ4

2005-2006 Chevy Silverado 1500 HD

GM LQ4

2007 Chevy Silverado 1500 HD

GM LQ9

2007 Chevy Silverado 1500 HD Classic

GM LQ4

2000-2004 Chevy Silverado 2500

GM LM7
GM LQ4

2005 Chevy Silverado 2500

GM LQ9

2001-2011 Chevy Silverado 2500 HD

GM LQ4

2007 Chevy Silverado 2500 HD Classic

GM LQ4

2001-2006 Chevy Silverado 3500

GM LQ4

2007 Chevy Silverado 3500 Classic

GM LQ4

2007-2011 Chevy Silverado 3500 HD

GM LQ4

2014-2017 Chevy SS

GM LS3

2003-2004 Chevy SSR

GM LM4

2014 Chevy Suburban

GM LMG
GM LY5

2000-2001 Chevy Suburban 1500

GM LM7

2002-2006 Chevy Suburban 1500

GM L59
GM LM7

2007-2009 Chevy Suburban 1500

GM LC9
GM LMG
GM LY5

2010-2011 Chevy Suburban 1500

GM LC9
GM LMG

2012-2014 Chevy Suburban 1500

GM LMG
GM LY5

2000-2006 Chevy Suburban 2500

GM LQ4

2012-2013 Chevy Suburban 2500

GM LMG
GM LY5

2000-2006 Chevy Tahoe

4.8 Chevy LS V8
GM L59
GM LM7

2007 Chevy Tahoe

4.8 Chevy LS V8
GM LMG
GM LY5

2008 Chevy Tahoe

6.2 Chevy LS V8
GM LC9
GM LMG

2009-2011 Chevy Tahoe

GM LC9
GM LMG

2012-2014 Chevy Tahoe

GM LMG
GM LY5

2002-2005 Chevy Trailblazer

GM LH6

2006-2009 Chevy Trailblazer

GM LS2

2002-2009 GMC Envoy

GM LM4

2002-2006 GMC Envoy XL

GM LM4

2004-2005 GMC Envoy XUV

GM LM4

2001-2005 GMC Savana 1500

4.8 Chevy LS V8
GM LM7
GM LQ4

2006 GMC Savana 1500

4.8 Chevy LS V8
GM L33
GM LM7
GM LQ4

2007-2014 GMC Savana 1500

4.8 Chevy LS V8
GM L33
GM LQ4

2001-2005 GMC Savana 2500

4.8 Chevy LS V8
GM LM7
GM LQ4

2006-2013 GMC Savana 2500

4.8 Chevy LS V8
GM L33
GM LQ4

2002-2005 GMC Savana 3500

4.8 Chevy LS V8
GM LM7
GM LQ4

2006-2013 GMC Savana 3500

4.8 Chevy LS V8
GM L33
GM LQ4

1999-2011 GMC Sierra 1500

GM L20
GM LC9
GM LMG

2007 GMC Sierra 1500 Classic

GM L33
GM L59
GM LM7

2001-2003 GMC Sierra 1500 HD

GM LQ4

2005-2006 GMC Sierra 1500 HD

GM LQ4

2007 GMC Sierra 1500 HD Classic

GM LQ4

1999-2001 GMC Sierra 2500

GM LM7
GM LQ4

2002-2004 GMC Sierra 2500

GM LQ4

2001-2011 GMC Sierra 2500 HD

GM LQ4

2007 GMC Sierra 2500 HD Classic

GM LQ4

2001-2006 GMC Sierra 3500

GM LQ4

2007 GMC Sierra 3500 Classic

GM LQ4

2001 GMC Sierra C3

GM LQ4

2000-2011 GMC Yukon

4.8 Chevy LS V8
GM L20
GM LM7
GM LY2

2012-2013 GMC Yukon

GM LC9
GM LMG

2000 GMC Yukon XL 1500

GM LM7

2001-2011 GMC Yukon XL 1500

GM L59
GM LM7
GM LQ4

2000-2011 GMC Yukon XL 2500

GM LQ4

2003-2007 Hummer H2

GM LQ4

2008-2009 Hummer H2

6.2 Chevy LS V8

2008-2009 Hummer H3

GM LH8

2009 Hummer H3T

GM LH8

2009 Pontiac G8

GM LS3

2005-2006 Pontiac GTO

GM LS2