DOUGS HEADERS D521-B Coated 694342543587 326-455 1/3

( Brand: Dougs Headers ), ( Manufacturer Part Number: D521-B ), ( UPC: 694342543587 )

Review DOUGS HEADERS Black Hi temp Coated Pontiac 1-3 fits 1965–1968

Introducing the Doug's Headers D521-B Hi-Temp Coated 1965-1968 Pontiac 326-455 1-3 header set, a high-performance exhaust solution designed to deliver improved power and enhanced exhaust flow for your classic Pontiac muscle car.

These headers are meticulously crafted from premium 321 stainless steel, renowned for its exceptional strength and resistance to corrosion. The D521-B set comes with a high-temperature ceramic coating, ensuring a durable finish that can withstand the extreme temperatures generated during high-performance driving.

Each header is designed with a 1-3 design, meaning that there is one primary and three secondary tubes. This design provides more efficient exhaust gas scavenging, reducing the amount of exhaust gas left in the combustion chamber between cycles. This results in better engine performance and increased horsepower.

The Doug's Headers D521-B set is also designed to provide excellent fitment and ease of installation. The headers come with all necessary gaskets and hardware, ensuring a secure and proper installation. The flanges are precision-machined to OEM specifications, providing a perfect fit for your 1965-1968 Pontiac 326-455 engine.

Furthermore, these headers are designed to work seamlessly with your factory exhaust system. However, for maximum performance, we recommend pairing them with a high-performance exhaust system. The Doug's Headers D521-B set is a must-have upgrade for any Pontiac enthusiast looking to unlock the full potential of their classic muscle car.

In summary, the Doug's Headers D521-B Hi-Temp Coated 1965-1968 Pontiac 326-455 1-3 header set is a high-quality, performance-enhancing exhaust solution for your classic Pontiac. Made from premium 321 stainless steel with a durable ceramic coating, these headers provide improved power, enhanced exhaust flow, and excellent fitment for a seamless installation. Upgrade your Pontiac today with the Doug's Headers D521-B header set.

Doug's Headers D521-B hi-temp coated 1965-1968 Pontiac 326-455 1-3 exhaust headers are a popular aftermarket upgrade for those looking to improve their engine's performance. Here are some pros and cons to consider before making a purchase.

1. Improved Performance: Doug's Headers are designed to improve engine performance by reducing exhaust gas flow restrictions and providing better scavenging of spent gases. This can lead to increased horsepower and torque.

2. Durability: The headers are made from high-quality stainless steel and are coated with a durable high-temperature ceramic coating, making them resistant to corrosion and heat.

3. Custom Fit: Doug's Headers are designed to be a direct fit for 1965-1968 Pontiac 326-455 engines, making installation easy and straightforward.

4. Improved Sound: Doug's Headers produce a great exhaust note, providing a satisfying sound for car enthusiasts.

1. Cost: Doug's Headers can be expensive compared to stock exhaust systems.

2. Installation Complexity: Installing headers can be a complex process, especially for those without experience. It may require the use of special tools and the removal of various engine components.

3. Exhaust Leakage: There is a risk of exhaust leakage if the headers are not installed correctly. Proper sealing is essential to prevent exhaust gases from escaping.

Doug's Headers D521-B hi-temp coated 1965-1968 Pontiac 326-455 1-3 exhaust headers offer numerous benefits, including improved performance, durability, custom fit, and improved sound. However, they also come with some drawbacks, such as cost, installation complexity, and the risk of exhaust leakage.

If you are looking to improve the performance of your 1965-1968 Pontiac 326-455 engine and are willing to invest in a high-quality aftermarket exhaust system, Doug's Headers D521-B headers are a great option. However, it is essential to ensure that they are installed correctly to avoid exhaust leakage and potential damage to the engine. Consider seeking professional installation to ensure the best possible results.

part # d521 prices

• $1146.65-$1466.95

specifications maniheader:

• for makes: Pontiac
• for years: 1965-1968
• brand: Dougs Headers
• manufacturer part number: D521-B
• upc: 694342543587

general maniheader:

• condition: New
• Car Truck Parts Accessories > Exhaust Emission Systems > Manifolds Headers

shipping maniheader:

• service: Standard
• type: Fixed
• transit: 4-7 Days
• class: Standard
• cost: $0.00

offer maniheader:

• options: Ship-to-home
• sold: 0
• availability: In Stock
• quantity: 8
• started: October 23, 2025

seller maniheader:

• # reviews: 602762
• rating: 98.5%

returns maniheader:

• time: 30 Days
• paid by: Seller
• policy: Returns Accepted

payments maniheader:

• other
• credit card: Mastercard
• wallet: Apple-pay

Dougs Headers D521 Is Similar To:

• Dougs Headers D308 Exhaust Header-power Steering Auto Trans Power Brakes (39.2% similar) $1008.99–$1064.21. (August 26th, 2024)
• Dougs D521 Coated Headers 1965 1966 1967 1968 Pontiac Catalina 326-389-400-455 (51% similar) $399.00. (September 17th, 2024)
• Dougs Headers D366 Y 5 01 Tri-y Chrome Ceramic Coated Sbc (45.3% similar) $1190.19. (September 27th, 2024)
• Dougs Headers D950 Corvette Exhaust Hi Flow Glass Pack Part No (37.6% similar) $303.94–$1600.00. (September 29th, 2024)
• Dougs Headers Dec300a-1 Electric Cut-out 3 Inch Single Cut (41.9% similar) $341.45–$434.43. (October 12th, 2024)
• Dougs Headers D569 Used-ish 1967-1969 Firebird 326-455 1 3/4 Inch Primary 3 - (54.1% similar) $1203.90–$1291.49. (December 4th, 2024)
• Dougs Headers 9430e 1964-70 Ford Mustang Tri-y Ceramic Coated (40.9% similar) $699.99. (December 9th, 2024)
• Dougs Headers Mp700158 1962-72 Mopar B-body Big Block 1 3/4 Inch Full Length Header With Metallic (28.6% similar) $1008.99. (December 9th, 2024)
• Dougs Headers Mp700161 1962-72 Mopar B-body Big Block 2 Inch Full Length Header With Black Hi-temp (36.7% similar) $1180.35. (December 12th, 2024)
• Dougs D569-b Headers Exhaust Header (37.7% similar) $303.94–$1534.88. (December 12th, 2024)
• Dougs D337-b Headers Black For 1967-1988 Chevy A F G Body 262-400 (51.5% similar) $1099.28. (December 12th, 2024)