DOUGS HEADERS D564-B Steel 694342543877 326-400 V8

( Brand: Dougs Headers ), ( Material: Steel ), ( Seller: Summit Racing Equipment ), ( Header Flange Thickness: 3/8 In. ), ( Header Style: Full-length ), ( Header Finish: High Temperature Black Paint ), ( Header Primary Tube Size: 1 3/4 In. ), ( Header Outlet Diameter: 3.000 In. ), ( Header Port Style: D-port ), ( Primary Tube Gauge: 16-gauge ), ( UPC: 694342543877 ), ( Manufacturer Part Number: D564-B )

Review DOUGS HEADERS Full length Steel Painted Pontiac V8 Pair

Doug's Headers, part number D564-B, are a full-length, high-performance exhaust header system designed specifically for Pontiac V8 engines with a displacement of 326 to 400 cubic inches. These headers are manufactured using premium T304 stainless steel, ensuring superior strength, durability, and resistance to corrosion.

The D564-B headers are a full-length design, meaning they extend from the cylinder head all the way to the exhaust manifold flange. This design provides several benefits over traditional header designs. First, it allows for a more efficient exhaust flow, as there are no restrictions from the catalytic converter or muffler. Second, it results in a more balanced exhaust pulse, which can lead to improved engine performance and increased power output.

The headers feature a 1.625-inch primary tube diameter, which provides ample flow capacity while still fitting within the constraints of most factory exhaust systems. The collector diameter is 3.75 inches, which is larger than many OEM collectors, allowing for optimal flow and reduced backpressure. The headers also come with 3/8-inch thick exhaust flanges, ensuring a secure and leak-free connection to the exhaust system.

Doug's Headers are designed with a mirror-polished finish, giving them a professional and attractive appearance. However, it is important to note that the mirrored finish may require additional maintenance to keep it looking its best. For those who prefer a more low-key look, the headers are also available with a satin finish.

Installing the Doug's Headers D564-B is a relatively straightforward process, but it does require some experience with exhaust system installation. The headers come with detailed instructions and all necessary hardware for a bolt-on installation. However, it is recommended that the installation be performed by a professional to ensure proper fitment and function.

Overall, the Doug's Headers D564-B are a high-quality, high-performance exhaust header system that is ideal for Pontiac V8 engines with a displacement of 326 to 400 cubic inches. With their full-length design, large collector diameter, and premium T304 stainless steel construction, these headers offer significant benefits in terms of performance, durability, and appearance.

Doug's Headers D564-B full-length steel headers are aftermarket exhaust headers designed for Pontiac 326-400 V8 engines. These headers offer several benefits and potential drawbacks, which are discussed below.

1. Increased Performance: Doug's Headers are designed to improve exhaust flow and reduce backpressure, which can lead to increased horsepower and torque.

2. Enhanced Sound: These headers provide a more aggressive exhaust note, which is desirable for many performance enthusiasts.

3. Durability: Full-length steel headers are known for their durability and resistance to corrosion and heat damage.

4. Versatility: Doug's Headers can be used in a variety of applications, including street performance, drag racing, and road racing.

5. Easy Installation: The headers come with detailed instructions, and most installations can be completed in a few hours.

1. Cost: Doug's Headers are more expensive than stock headers, which can be a significant investment for some enthusiasts.

2. Weight: Full-length steel headers are heavier than other materials, such as aluminum, which can affect handling and fuel economy.

3. Exhaust Manifold Modifications: Installing headers may require modifications to the exhaust manifold or engine components, which can be time-consuming and costly.

4. Catalytic Converter Compatibility: Depending on the specific application, it may be necessary to use a high-performance catalytic converter to ensure proper emissions compliance.

Doug's Headers D564-B full-length steel headers offer significant performance benefits for Pontiac 326-400 V8 engines. However, these benefits come at a cost, and enthusiasts should carefully consider the pros and cons before making a purchase. If the investment is worth it for the desired performance increase and improved exhaust note, then Doug's Headers are a solid choice for those looking to enhance their Pontiac V8.

part # d564 price

• $1328.59

specifications maniheader:

• for makes: Pontiac
• brand: Dougs Headers
• material: Steel
• seller: Summit Racing Equipment
• header flange thickness: 3/8 In.
• header style: Full-length
• header finish: High Temperature Black Paint
• header primary tube size: 1 3/4 In.
• header outlet diameter: 3.000 In.
• header port style: D-port
• primary tube gauge: 16-gauge
• upc: 694342543877
• manufacturer part number: D564-B

shipping maniheader:

• service: Economy
• transit: 3-6 Days
• class: Economy
• type: Fixed
• cost: $0.00

general maniheader:

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

offer maniheader:

• started: June 10, 2026
• quantity: 4
• options: Ship-to-home
• sold: 0
• availability: In Stock

seller maniheader:

• rating: 99.7%
• # reviews: 1148613

returns maniheader:

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

payments maniheader:

• credit card: Discover
• wallet: Google-pay
• other

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