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Photo of Headers, Dougs, 1965-68 Bonn/Cat/GP 326/455 1-3/4", Full Length

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Doug's Headers

Headers, Dougs, 1965-68 Bonn/Cat/GP 326/455 1-3/4", Full Length

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Part# : DH0D521

Mfg#: D521

Sold As: Pair

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^$1,023.⁹⁹

List Price: $1,126.95

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Vehicle Specific View fitment for 3 models

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Doug's headers feature heavy wall construction with 3/8"-thick mounting flanges, ensuring durability and longevity under the most demanding circumstances. All the necessary mounting hardware is included with each set: bolts, gaskets and reducers.

326-455 with AC, PS, PB, AT and MT - floorshift only 1-3/4" tubes, 3" collector., D-Port APPLICATION: - Requires removal or modification of locking steering columns if equipped - Some factory heads do not have end bolts and should be drilled and tapped for proper sealing

Notes

This item is not eligible for any further discounts or promotional pricing.
SHIP NOTE: Item exceeds standard ground freight size/weight, and is not eligible for free ground shipping.
SHIP NOTE: This item is SPECIAL ORDER and will drop-ship from the manufacturer. While the majority of drop ship orders experience no delays, please be advised that OPGI does not control delivery times.

This product is not legal for street use on an emissions-controlled vehicle. It may be used on dedicated competition or pre-pollution-controlled vehicles only. Learn More

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2025 Grand Prix 1962-77 223

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WARNING: This product can expose you to chemicals including lead, sulfur, nickel, chromium, vanadium, titanium, polyvinyl chloride, and 4,4’-methylenebis (2-chloroaniline), which are known to the State of California to cause cancer and birth defects or other reproductive harm. For more information go to www.P65Warnings.ca.gov.

Vehicle Fitment

Year Make Model	Application Details
1965–1968 Pontiac Bonneville
1965–1968 Pontiac Catalina
1965–1968 Pontiac Grand Prix

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