The Skunk2 Pro Series Intake Manifold for the Honda K20Z3 engine is engineered as a direct high-performance replacement for RBC-style intake manifolds. Designed to improve airflow, mid-range power, and peak horsepower, this manifold features an oversized plenum and large tapered runners—ideal for naturally aspirated and turbocharged setups alike.

Cast from aircraft-grade A356 aluminum, this one-piece manifold offers improved runner geometry, thicker walls for porting, and sits at a lower profile than the OEM RBC manifold—making it an excellent fit for tight engine bays such as EF/DA K-swaps. Every unit is vacuum tested and finished with a Skunk2 Pro Series nameplate for quality assurance.

Key Features:

• Cast from high-strength A356 aircraft-grade aluminum

• Oversized plenum with large, tapered runners for maximum airflow

• 72mm throttle body opening (can be ported to 76mm)

• Enhanced runner entries improve air velocity and venturi effect

• Compact design provides better hood clearance for engine swaps

• Thicker runner walls allow aggressive porting

• Direct bolt-on for OEM sensors and components

• Ideal for both turbocharged and naturally aspirated builds

Recommended Upgrades:

• Fuel Rail: Composite Fuel Rail (P/N 350-05-5015)

• Throttle Bodies:

  • Alpha 70mm (P/N 309-05-1060)

  • Alpha 74mm (P/N 309-05-1070)

• Sensors:

  • TPS Sensor (P/N 352-05-1410)

  • 3-Bar MAP Sensor (P/N 352-05-1515)

  • 4-Bar MAP Sensor (P/N 352-05-1500)

• Thermal Gasket:

  • Intake Manifold Gasket (P/N 372-05-0370 – Skunk2 Pro Series only)

Vehicle Fitment:

• Honda Civic Si (2006–2011) with K20Z3 engine

Included:

• (1) Skunk2 Pro Series Intake Manifold