User Manuals, Instructions and Guides for DOUG S HEADERS products.

DOUG S HEADERS D3358 LS Engine Swap Mid Length Header Instruction Manual

Discover the D3358 LS Engine Swap Mid Length Header for 1970-81 Camaros. Designed for compatibility with GM automatic transmissions and T56 stick shift. Learn how to install and use this product effectively with Doug's Engine Swap motor mount brackets #SK103. Not compatible with factory column shifters.

DOUG S HEADERS D306 Metallic Ceramic Coated Headers for 396-502 Chevrolet Instruction Manual

Learn how to install and use the D306 Metallic Ceramic Coated Headers for 396-502 Chevrolet engines. Suitable for various models, this user manual provides step-by-step instructions and important product information. Ensure a proper fit and maximize performance with these high-quality headers.

DOUG S HEADERS D3373 4.8-6.2L Emissions Legal Headers Instruction Manual

Learn how to install the D3373 4.8-6.2L Emissions Legal Headers with this comprehensive user manual. Perfect for 2002-2015 G.M. Pickups, Yukon, Tahoe, and Suburban. Includes instructions, product information, and warranty details. Get the most out of your headers today!

DOUG S HEADERS D104-R Full Length Header Instruction Manual

Learn how to install D104-R Full Length Headers on your AMC vehicle with our easy-to-follow user manual. Improve your exhaust flow and increase horsepower with this high-quality product. Get step-by-step installation instructions and all the necessary hardware included. Perfect for AMC 68-74 Javelin/AMX, 71-74 Matador, and 72-76 Gremlin owners.

DOUG S HEADERS D309Y Chevrolet 348-409 W Block Long Tube Headers Instruction Manual

Learn how to install DOUG S HEADERS' D309Y and D309Y-B Chevrolet 348-409 W Block Long Tube Headers with our comprehensive user manual. Follow step-by-step instructions and use high-quality materials for improved durability and performance. Get ready to replace your stock manifolds to enhance your car's performance and efficiency.