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Flowmaster Manifold Downpipe Kit

Fits 1967-1972 GM C10 2wd trucks with SBC engine.

PART# 81072

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Flowmaster introduces their manifold downpipes for 1967-1972 GM C10/C15 1/2 ton 2WD pickups with small block V8 engines. These 2.50-inch mandrel bent 409S stainless steel downpipes fit only the factory Angled GM Ram Horn style manifolds and include 3 bolt flanges, donut gaskets and donut sleeves. These downpipes are covered by Flowmaster's Lifetime Limited Warranty and can be used with systems part number 17654 or part number 817654 for a complete engine back exhaust installation.


  • To Adapt Exhaust to Factory Rams Horns Manifolds
  • Mandrel-bent 16 Gauge Stainless Steel Tubing
  • Includes all Necessary Hardware
  • For SBC Engine Applications
  • Lifetime Limited Warranty
  • Flowmaster Quality


Emission Code3
Heat ShieldNo
Inlet Diameter (in)2
MaterialStainless Steel
Outlet Diameter (in)2.5
Product TypeExhaust Accessories
Single DualDual
System TypeManifold Downpipes
Tubing Diameter (in)2.5
California Proposition 65 Chemical NameChromium (hexavalent compounds)
Nickel (Metallic)
California Proposition 65 RequiredYes
Part Number81072



This part is legal for sale and use on Uncontrolled (Non-Emissions Controlled) Vehicles and Racing Use Only Vehicles.

The following vehicles are considered Uncontrolled (Non-Emissions Controlled) Vehicles:

  • 1965 and older U.S. manufactured California Certified vehicles
  • 1967 and older U.S. manufactured Federally Certified vehicles
  • 1967 and older Foreign manufactured vehicle

The following vehicles are considered Racing Use Only Vehicles:

  • Racing Use Only Vehicles are vehicles that are used exclusively for competition and that are not registered and that may never be used on the street

WARNING: It is against the law to install this part on an Emissions Controlled Vehicle

The following vehicles are considered Emissions Controlled Vehicles:

  • 1966 and newer U.S. manufactured California Certified vehicles
  • 1968 and newer U.S. manufactured Federally Certified vehicles
  • 1968 and newer Foreign manufactured vehicle

Tech Resources

Fits 1967-1972 GMC/Chevrolet C10 and C15 1/2 Ton 2 wheel drive pickup with SBC engine. Includes flanges and gaskets. Fits only with factory GM Angled Ram Horn manifolds


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        Some parts are not legal for use in California or other states with similar regulations.

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