Doug's Headers - D3373

Doug's Headers D3373 1 5/8" 4-Tube Manifold Replacement Header Chevrolet Truck 5.3L 02-13 Metallic Ceramic Coating

Doug's Headers D3373 1 5/8" 4-Tube Manifold Replacement Header Chevrolet Truck 5.3L 02-13 Metallic Ceramic Coating

Part Number: D3373 / UPC 694342508425
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Highlights

  • Doug's Headers D3373 Metallic Ceramic Coating
  • 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 is finished with a Metallic Ceramic Thermal Barrier Coating polished to a high luster appearance offering corrosion and heat resistance up to 1400 degrees

Additional Information

Doug's 2/4 WD TRUCK HEADERS Long Tube Metallic Ceramic Coated Header 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.

Installation instructions

Instruction Manual
Installation Instructions

Download PDF

Shipping & Delivery

Our ignition and exhaust products ship from our warehouse in Lenexa, KS. Our normal shipping time is 2-3 business days for in-stock parts.

 Shipping Class Order Value Shipping Cost
UPS Ground $0 - 49.99 $6.99 flat rate
UPS Ground $50 - 98.99 $7.49 flat rate
UPS Ground $99+ Free

  • At this time, PerTronix does not offer expedited shipping options from our website.
  • All packages must be inspected upon receipt for any missing or damaged goods and claims for such must be made within 7 days of receipt.
  • PerTronix does not currently ship our products internationally from our web store. For international orders call 909-599-5955 or connect with us here.

Returns & Replacements

Returns at Pertronix are accepted within 90 days of purchase with prior authorization, ensuring items are in new, resalable condition. To initiate a return, call for an RGA and follow provided instructions. Customers are responsible for return shipping, using a trackable method.

Refunds exclude initial shipping and handling fees and may be subject to a restocking fee. For defective or damaged items, contact Pertronix directly. We are not responsible for user-initiated damage/loss of parts.

For complete details, visit our Returns page.

Reviews

Doug's Headers - D3373

Doug's Headers D3373 1 5/8" 4-Tube Manifold Replacement Header Chevrolet Truck 5.3L 02-13 Metallic Ceramic Coating

Doug's Headers D3373 1 5/8" 4-Tube Manifold Replacement Header Chevrolet Truck 5.3L 02-13 Metallic Ceramic Coating

Part Number: D3373 / UPC 694342508425
Regular price $599.95
Sale price $599.95 Regular price

Part Number: D3373 / UPC 694342508425
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Need help? Call us at 909-599-5955

  • Free shipping on $99+ orders in lower 48 states
  • 90-day return policy
  • We’re here to help! Call us on 909-599-5955
Emissions code

Emissions Code

Continue Reading to Understand Emissions Codes

C.A.R.B. EO Number: D-57-48

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Highlights

  • Doug's Headers D3373 Metallic Ceramic Coating
  • 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 is finished with a Metallic Ceramic Thermal Barrier Coating polished to a high luster appearance offering corrosion and heat resistance up to 1400 degrees

Additional Information

Doug's 2/4 WD TRUCK HEADERS Long Tube Metallic Ceramic Coated Header 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.

Installation instructions

Instruction Manual
Installation Instructions

Download PDF

Shipping & Delivery

Our ignition and exhaust products ship from our warehouse in Lenexa, KS. Our normal shipping time is 2-3 business days for in-stock parts.

 Shipping Class Order Value Shipping Cost
UPS Ground $0 - 49.99 $6.99 flat rate
UPS Ground $50 - 98.99 $7.49 flat rate
UPS Ground $99+ Free

  • At this time, PerTronix does not offer expedited shipping options from our website.
  • All packages must be inspected upon receipt for any missing or damaged goods and claims for such must be made within 7 days of receipt.
  • PerTronix does not currently ship our products internationally from our web store. For international orders call 909-599-5955 or connect with us here.

Returns & Replacements

Returns at Pertronix are accepted within 90 days of purchase with prior authorization, ensuring items are in new, resalable condition. To initiate a return, call for an RGA and follow provided instructions. Customers are responsible for return shipping, using a trackable method.

Refunds exclude initial shipping and handling fees and may be subject to a restocking fee. For defective or damaged items, contact Pertronix directly. We are not responsible for user-initiated damage/loss of parts.

For complete details, visit our Returns page.

Reviews

Applications

Year / Make / Model 2006 Chevrolet Avalanche 1500
Engine Type V8
Engine Size(s) Liters: 5.3
Cubic Inches: 325
Notes

Year / Make / Model 2002-2007 Chevrolet Silverado 1500
Engine Type V8
Engine Size(s) Liters: 4.8
Cubic Inches: 294
Notes

Year / Make / Model 2006-2007 Chevrolet Silverado 1500
Engine Type V8
Engine Size(s) Liters: 5.3
Cubic Inches: 325
Notes

Year / Make / Model 2007 Chevrolet Silverado 2500
Engine Type V8
Engine Size(s) Liters: 5.3
Cubic Inches: 325
Notes

Year / Make / Model 2006-2007 Chevrolet Suburban 1500
Engine Type V8
Engine Size(s) Liters: 5.3
Cubic Inches: 325
Notes

Year / Make / Model 2002-2007 Chevrolet Tahoe
Engine Type V8
Engine Size(s) Liters: 4.8
Cubic Inches: 294
Notes

Year / Make / Model 2006-2007 Chevrolet Tahoe
Engine Type V8
Engine Size(s) Liters: 5.3
Cubic Inches: 325
Notes

Year / Make / Model 2002-2007 GMC Sierra 1500
Engine Type V8
Engine Size(s) Liters: 4.8
Cubic Inches: 294
Notes

Year / Make / Model 2006-2007 GMC Sierra 1500
Engine Type V8
Engine Size(s) Liters: 5.3
Cubic Inches: 325
Notes

Year / Make / Model 2002-2007 GMC Yukon
Engine Type V8
Engine Size(s) Liters: 4.8
Cubic Inches: 294
Notes

Year / Make / Model 2005-2007 GMC Yukon
Engine Type V8
Engine Size(s) Liters: 5.3
Cubic Inches: 325
Notes

Year / Make / Model 2006-2007 GMC Yukon XL 1500
Engine Type V8
Engine Size(s) Liters: 5.3
Cubic Inches: 325
Notes

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