The Skunk2 Ultra Series Street Intake Manifold is a high-performance intake solution engineered for modified Honda K-Series engines including K20 and K24 platforms. Developed using advanced CFD (Computational Fluid Dynamics) technology and extensive dyno testing, this intake manifold significantly improves airflow efficiency, resulting in measurable horsepower and torque gains compared to many competing designs.
The Ultra Series manifold features a two-piece modular cast aluminium design that allows easy disassembly for porting, servicing, or plenum volume upgrades using optional spacers. Its carefully engineered plenum and high-velocity runners distribute airflow evenly across all cylinders, ensuring consistent performance under dynamic load conditions.
Manufactured from high-grade 356 aluminium alloy, the manifold is both lightweight and extremely durable. Each unit is CNC-machined to ensure precise fitment and undergoes individual inspection for quality assurance.
With its 1.8L plenum volume, raised velocity stacks, and long tapered runners, the Ultra Street manifold delivers improved mid-range torque while maintaining strong top-end airflow, making it ideal for high-performance naturally aspirated builds as well as mild turbo or supercharged setups.
This intake manifold is a popular upgrade for Honda Civic, Integra, and K-swap builds where increased airflow and engine efficiency are required.
Torque Lab is an official Skunk2 performance parts supplier, providing professional advice and technical support for Honda performance builds.
Key Features
• Modular 2-piece intake manifold design with removable plenum
• Rotatable plenum allowing driver-side or passenger-side throttle body mounting
• 1.8L plenum volume for improved airflow capacity
• 6.85" high-velocity tapered runners for optimized airflow distribution
• Raised velocity stack entries for improved cylinder filling
• 71mm throttle body opening for increased airflow potential
• Thick runner walls designed for port matching and performance tuning
• Lightweight 356 cast aluminium construction
• CNC-machined for precise fitment
• Thermal gasket included to reduce heat transfer
• Integrated accessory ports (2 × 1/4" NPT and 2 × 1/8" NPT)
Engine Compatibility
Designed for Honda K-Series engines using early PRB/PRC intake flange patterns.
Compatible engines include:
• K20A
• K20A2
• K20Z1
• K24A1
Compatible with cylinder heads:
• PRB
• PRC
Can also be installed on RBC and RBB cylinder heads using the appropriate adapter solutions.
Vehicle Fitment
Suitable for multiple Honda platforms and K-swap builds including:
• Honda Civic Si EP3 (2002-2005)
• Acura RSX / RSX Type-S (2002-2006)
• Honda K-Series engine swap vehicles
Installation on Civic EP3 requires minor modifications such as radiator support trimming and possible TPS wiring extension.
Recommended Supporting Components
For optimal performance, Skunk2 recommends the following components:
Fuel Rail
Ultra Street Fuel Rail – P/N 350-05-7000
Throttle Bodies
Alpha Throttle Body 70mm – P/N 309-05-1060
Alpha Throttle Body 74mm – P/N 309-05-1070
Pro Throttle Body 70mm – P/N 309-05-0080 / 0085
Pro Throttle Body 74mm – P/N 309-05-0090 / 0095
Sensors
TPS Sensor – P/N 352-05-1410
MAP Sensor 3 Bar – P/N 352-05-1515
MAP Sensor 4 Bar – P/N 352-05-1500
Adapters
RBC Throttle Body Adapter – P/N 309-05-0120
TPS Adapter K to B – P/N 309-05-0100
Optional Upgrade
Optional Ultra Street Billet Aluminium Plenum Spacer (.5L) increases plenum volume and airflow capacity.
Available versions:
Ultra Street Plenum Spacer Silver – P/N 907-05-9100
Ultra Street Plenum Spacer Black – P/N 907-05-9101
