Skunk2 Ultra Street Intake Manifold | 16-21 Civic 1.5T & Si

Fits:

• 2016 - 2021 Honda Civic 1.5T (Coupe, Hatch, Sedan)
• 2017 - 2020 Honda Civic Si (Coupe, Sedan)

Tune required for optimal performance. Fits stock throttle body and upcoming Skunk2 Pro throttle bodies. Optional 0.5L billet aluminum plenum spacer sold separately.

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We're running this manifold on both the UNITY SI-R and UNITY HFP shop builds with great results. Unlike a traditional single-piece manifold, Skunk2's modular 2-piece design can be disassembled for porting, cleaning, and plenum volume changes using separately sold spacers — the expandable plenum lets you tailor airflow and volume to your specific build rather than being locked into one fixed geometry.

The design comes out of Skunk2's own CFD modeling and extensive dyno and real-world testing, with an optimized plenum that distributes airflow evenly to all cylinders even under dynamic load. It's cast from high-grade 356 aluminum for strength at low weight, CNC machined for precision, with thick-walled runners that leave plenty of room for porting and a 74mm throttle body opening for maximum flow.

Features

• Modular 2-piece design with removable, rotatable plenum (driver or passenger-side throttle body mounting)
• 1.8L plenum volume
• Tapered high-velocity runners with generously cast walls for porting
• 74mm throttle body opening
• Provisions for secondary fuel injection
• 356 aluminum alloy construction, CNC machined
• 4x 1/8" NPT and 3x 1/4" NPT accessory ports
• Includes thermal gasket and high-grade mounting hardware
• Proven on Unity's own SI-R and HFP shop builds