Description
Overview
The Flowmaster Manifold Downpipe Kit is purpose-built for classic Ford Mustang owners looking to upgrade their exhaust with a proven bolt-on solution. Engineered specifically for 1964-1966 Ford Mustangs equipped with the 289 c.i. engine, this dual downpipe kit ships as a complete pair, giving you everything needed to route exhaust gases cleanly away from the manifolds and into a matched Flowmaster system.
Each downpipe is constructed from durable 409S stainless steel and features smooth 2.50-inch mandrel-bent tubing. The mandrel-bent design maintains a consistent internal diameter through every bend, promoting steady exhaust flow without the restrictive crimping found in cheaper stamped pipes. With a natural finish, these downpipes deliver a clean, no-nonsense look that fits right into a period-correct build.
Key Benefits
Flowmaster designed this kit to take the guesswork out of your exhaust project. The downpipes include the 2-bolt flanges, donut gaskets, and donut sleeves required for a proper, leak-resistant connection, so you have the hardware on hand to complete the job. Sized with a 2.00-inch inlet, 2.50-inch outlet, and 2.50-inch main piping, the geometry is dialed in for the 289-powered Mustang application.
- Manufactured from rugged 409S stainless steel for lasting durability
- 2.50-inch mandrel-bent tubing for smooth, consistent exhaust flow
- Sold as a complete pair (dual configuration) for both sides of the engine
- Includes 2-bolt flanges, donut gaskets, and donut sleeves
- Natural finish for a clean, classic appearance
- 2.00-inch inlet, 2.50-inch outlet, 2.50-inch main piping
System Compatibility
These manifold downpipes are engineered to mate directly with Flowmaster exhaust system #17273 or #817273, making them an ideal foundation for a fully integrated Flowmaster exhaust setup. Pairing the downpipes with the matched system ensures your components work together as designed, from the manifold connection all the way back.
Fitment
This kit is designed for 1964-1966 Ford Mustangs equipped with the 289 c.i. engine in a 2WD configuration. Confirm your vehicle matches these specifications before ordering to ensure a proper fit. Please note this product carries a California Proposition 65 warning, and no heat shield is included.
Backed by Flowmaster’s Lifetime Limited Warranty, this downpipe kit gives classic Mustang enthusiasts a dependable, quality-built exhaust upgrade from a name trusted in performance exhaust. Whether you’re restoring a numbers-matching classic or building a driver you’ll enjoy for years, these mandrel-bent stainless downpipes deliver the flow, durability, and correct fitment your 289 deserves.
