Description
Steed Speed | Cummins 5.9 Stock Replacement Manifold – Motorhome – 12 Valve Manifold / 3rd Gen Style
This Steed Speed manifold has the 12 valve square ports in a 3rd gen style (down and out between cylinders 4-5) orientation.
It can be flipped also for a forward/ upward outlet orientation between cylinders 2-3
A good option if stuck for space on conversion – popular Ford / Cummins conversion manifold
The best performing manifold on the market.
Constructed from CNC machined billet steel components, tig welded and ceramic coated for durability and reduced heat.
This manifold is dyno proven to outperform every competitor and has seen gains of 80HP at 2000 RPM over the stock factory manifold on a 350HP motor.
This manifold is also available with a T4 turbo flange for those who wish to upgrade their turbo.
Shipped Australia-Wide
- Dispatched from within Australia with tracking.
- Same-day dispatch on in-stock orders placed before 11am AEST, Monday–Friday.
- Shipping is calculated at checkout based on size, weight and your delivery address.
- Estimated delivery 2–7 business days depending on your location.
Freight question? Call us on (07) 5619 7869.
Steed Speed | Cummins 5.9 Stock Replacement Manifold – Motorhome – 12 Valve Manifold / 3rd Gen Style This Steed Speed manifold has the 12 valve square ports in a 3rd gen style (down and out between cylinders 4-5) orientation.
Double Duty Diesel — Manufacturer Pass-Through Warranty
Double Duty Diesel parts carry the original manufacturer's warranty:
- Fluidampr — Lifetime warranty on harmonic balancers
- MAHLE / Clevite — 12 months on bearings, gaskets, sealing components
- Dynomite Diesel — 12 months on stock-spec injectors and pumps; performance/race spec varies
- Power Driven Diesel — 12 months on turbos and bundled tuning kits
- Returns must be notified within 30 days of delivery
- Parts only — installation not covered
Workshop fitment available at Willys for transmissions, injectors and engine internals.
Read the full Double Duty Diesel warranty terms →
Warranty claims are coordinated through Willys Workshop. Email sales@willysworkshop.com.au or call Warana (07) 5619 7869 / Oxley (07) 3377 3421 with your order number and a description of the issue.
