Rocket Performance Garage Llc M8 Performance Intake Manifold - 2017-2024 (exc.v… — Harley-Davidson (2017-2024)

Rocket Performance Garage M8 performance intake manifold in T6 heat-treated cast aluminum with CNC-machined surfaces, designed to replace the restrictive OEM plastic M8 intake and unlock airflow gains on Milwaukee-Eight engines. Hand-ported high-flow design delivers measurable horsepower increases, especially on 114 cubic inch and larger displacement motors.

Features

• T6 heat-treated cast aluminum construction
• CNC-machined surfaces for precise port matching
• Hand-ported high-flow design
• New rubber O-ring included
• Outperforms competitor intake manifolds
• Direct OEM replacement fitment

Specifications

• Brand: Rocket Performance Garage
• Manufacturer Part #: 9-9000
• Material: T6 Heat-Treated Cast Aluminum
• Length: 9 in
• Width: 5 in
• Height: 5 in
• Weight: 1.5 lbs

Fitment

Fits 2017-2024 Harley-Davidson Milwaukee-Eight (M8) models, except as noted in model restrictions.

Frequently Asked Questions

Will this work on stock M8 engines or only big-bore kits?

Works on stock M8 and larger displacement motors. Performance gains are most dramatic on 114 cubic inch and larger engines when paired with a Rocket Cam.

Do I need to tune or rejet after installing this manifold?

Intake manifold replacement alone typically does not require remapping. Tuning will maximize gains when combined with cams or big-bore work.

How much horsepower can I expect to gain?

Gains vary based on engine displacement and other modifications. The OEM plastic manifold significantly restricts airflow, especially on larger motors — this aluminum replacement unlocks that potential.

What's included in the box?

The cast aluminum intake manifold, CNC-machined and hand-ported, plus a new rubber O-ring for the OEM gasket seal.

Is this a direct bolt-on replacement for the OEM plastic manifold?

Yes — direct fit using existing mounting points and hardware. No modifications needed.