Products to Compare (max of 3)
X
Compare These Parts
Talk to the Experts. Call 800.979.0122, 7am-10pm, everyday.
Customer Service
Since 1952
in
in
  • Expert Tech Support
  • Huge Inventory
  • Fast Shipping
Talk to the Experts. Call 800.979.0122
Shop By
Support
Account
Street Race Truck More... The Toolbox
Add to Cart
$1,261.36
$785.99
Doug's Headers D521 Full Length Header, 1-3/4 In, 65-68 Catalina, CC
Doug's Headers D521 Full Length Header, 1-3/4 In, 65-68 Catalina, CC

Doug's Headers D521 Full Length Header, 1-3/4 In, 65-68 Catalina, CC

389 Pontiac V8, 400 Pontiac V8, 421 Pontiac V8, 428 Pontiac V8, Full-length Header Tube Type

0 Reviews | 0 Answered Questions
Factory Shipped
Ships FREE
Select your vehicle to verify fitment.
Select Vehicle
Doug's Headers D521 Full Length Header, 1-3/4 In, 65-68 Catalina, CC
Doug's Headers D521 Full Length Header, 1-3/4 In, 65-68 Catalina, CC
Zoomed In Image
We estimate this item will ship on or before July 24th.
Part # 447D521
Save 37%
$785.99
$1,261.36
set
Quantity:
Add to Cart
Call to Order
Add to Buildlist
Compare

Details
Reviews
Q&A
Videos & Articles

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.

Details

Header Tube Type:
Full-length
Finish:
Metallic Ceramic Coating
Flange Style:
D Port
Primary Tube Diameter:
1-3/4"
Material Type:
Steel
Color:
Silver
MFG. Part #:
D521
Collector Diameter:
3 Inch
Hardware Included:
Yes
Gasket(s) Included:
Yes
Sold in Quantity:
Pair
GTIN Code:
694342509767

Info

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)

Application

1965-1966 Pontiac Bonneville 6.4L/389 V8
1967-1968 Pontiac Bonneville 6.6L/400 V8
1965-1966 Pontiac Bonneville 6.9L/421 V8
1967-1968 Pontiac Bonneville 7L/428 V8
1965-1966 Pontiac Catalina 6.4L/389 V8
1967-1968 Pontiac Catalina 6.6L/400 V8
1965-1966 Pontiac Catalina 6.9L/421 V8
1967-1968 Pontiac Catalina 7L/428 V8
1965-1966 Pontiac Grand Prix 6.4L/389 V8
1967-1968 Pontiac Grand Prix 6.6L/400 V8
1965-1966 Pontiac Grand Prix 6.9L/421 V8
1967-1968 Pontiac Grand Prix 7L/428 V8

Notes

  • Doug's Headers D521 1 3/4" 4-Tube Full Length Header Pontiac Catalina 326-455 65-68 Metallic Ceramic Coating
  • Ceramic Coated
  • Collector: 3
  • Port: D
  • Primary: 1 3/4
  • exc. states w/Calif. emission stds
  • removal or modification of locking steering column reqd
  • factory heads w/o end bolt holes and should be drilled and tapped for proper sealing.
  • with Floor Shifter
  • with A/C
  • For Off-Road Use Only
Some parts are not legal for use in California or other states with similar laws/regulations

More Like This

Reviews

Q & A

Videos & Articles

You May Also Like

Suggestions
Error
Note
Ok