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Doug's Headers D523 Full Length Header, 2 In, 70-74 Firebird, CC
Doug's Headers D523 Full Length Header, 2 In, 70-74 Firebird, CC

Doug's Headers D523 Full Length Header, 2 In, 70-74 Firebird, CC

350 Pontiac V8, 400 Pontiac V8, 455 Pontiac V8

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Doug's Headers D523 Full Length Header, 2 In, 70-74 Firebird, CC
Doug's Headers D523 Full Length Header, 2 In, 70-74 Firebird, CC
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We estimate this item will ship on or before May 30th.
Part # 447D523
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Important Messages:

  • This item ships directly from the manufacturer. It may take an additional 2 business days for Dougs Headers to ship this item.
  • Get FREE shipping when your order includes this item and exceeds $99! Ground shipping only in the contiguous US.
  • This item ships via Ground Shipping only. Expedited and Air shipping options are not available.


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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

Installation Instructions (PDF)


1970-1971 Pontiac Firebird 5.7L/350 V8
1970-1973 Pontiac Firebird 6.6L/400 V8
1971-1973 Pontiac Firebird 7.5L/455 V8


  • Doug's Headers D523 2" 4-Tube Full Length Header Pontiac Firebird 400-455 70-74 Metallic Ceramic Coating
  • Ceramic Coated
  • Collector: 3 1/2
  • Port Shape: RD
  • Primary Tube: 2
  • legal for off-highway use (exc. in Calif. or states using Calif. emission standards)
  • Fits Edelbrock Performer
  • RAM-Air
  • Super Duty and H.O. heads only
  • HO/SD engine
  • with Floor Shifter
  • with A/C
Some parts are not legal for use in California or other states with similar laws/regulations

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