Description
Overview
The Flowmaster Manifold Downpipe Kit is a purpose-built connection between your factory exhaust manifolds and the rest of your exhaust system, engineered specifically for 1967-1972 GM C10/C15 1/2 ton 2WD pickups equipped with a small block V8. Supplied as a matched pair in a dual configuration, these downpipes deliver a clean, direct-fit foundation for building a serious performance exhaust on the classic C-series trucks.
Each downpipe is crafted from 409S stainless steel and features mandrel-bent 2.50-inch tubing, which preserves a smooth, consistent inside diameter through every bend to promote steady exhaust flow. The natural finish keeps the focus on durable, corrosion-resistant construction, while the 2.00-inch inlet steps up to a 2.50-inch outlet to feed the larger diameter piping that follows.
Key Benefits
These manifold downpipes are designed to bolt in with the correct hardware and sealing components, taking the guesswork out of your exhaust project. They fit only the factory Angled GM Ram Horn style manifolds, so you get a tailored fit rather than a universal compromise. Backed by Flowmaster’s Lifetime Limited Warranty, they are built to be a lasting part of your truck’s exhaust setup.
- Mandrel-bent 2.50-inch tubing for smooth, consistent exhaust flow
- Durable 409S stainless steel construction with a natural finish
- Dual downpipe pair with 2.00-inch inlet and 2.50-inch outlet
- Includes 3-bolt flanges, donut gaskets, and donut sleeves for a complete connection
- Fits only the factory Angled GM Ram Horn style manifolds
- Covered by Flowmaster’s Lifetime Limited Warranty
What’s Included
Every kit ships as a complete pair with the sealing and mounting hardware you need to make the connection: 3-bolt flanges, donut gaskets, and donut sleeves. That means you have the essential components to mate the downpipes to your factory Ram Horn manifolds and move on to the rest of the system.
Fitment & System Compatibility
These downpipes are engineered for 1967-1972 GM C10/C15 1/2 ton 2WD pickups running a small block V8 with the factory Angled GM Ram Horn style manifolds. They are designed to work with Flowmaster systems part number 17654 or part number 817654, allowing you to combine them into a complete engine-back exhaust installation for your truck.
Please note the emission code is 3 and this product carries a California Proposition 65 warning. A heat shield is not included. If you are restoring or upgrading a small block C10 or C15, these Flowmaster manifold downpipes offer a direct, application-specific starting point for a full performance exhaust build.
