As of July 2025, Currently on backorder from Skunk2

This Skunk2 Ultra Street manifold offers a more cost effective way to get the most out of your build compared to the Skunk2 Ultra Race manifold.

You'll want a Skunk2 Alpha 70mm throttle body for this manifold with an Acuity TPS sensor. This intake manifold does not have an idle motor built in to it. If you don't have room for a bulky idle motor to hang on the bottom of a K series throttle body or if you track/race your car, the engine vibrations may cause long term damage to the idle motor sooner than you think.

In these cases we recommend our KPower idle motor relocation kit and to mount this plate to the chassis of your car. Be sure to use double ply rubber hose to ensure the line doesn't collapse.

We do recommend customers build braces to support the intake manifold from engine vibration.

The much anticipated Ultra "Street" Intake Manifold for the '02-'05 Civic Si and '02-'06 RSX/ RSX Type S, and/ or any swap using the K20A/ K20A2/ K20Z1/ K24A1 engines or cylinder heads has finally arrived!

The Ultra Series is years of research and development, culminated in a multi-piece cast aluminum intake manifold that offers advantages that only a modular design could allow. Using the latest in CFD (Computational Fluid Dynamics) software; Skunk2 Racing has created a two-piece modular design that allows for easy disassembly, porting, and plenum volume changes through the use of a removable plenum lid and optional plenum spacers. In addition to CFD testing, the Ultra Series Intake Manifold has undergone extensive in-house dyno testing which has led to a design that is less restrictive, yielding both torque and power gains well over many of the competitors.

Skunk2 Racing Ultra Street Intake Manifolds are cast-aluminum, manufactured from high-grade 356 aluminum alloy for strength and lightweight. Each manifold is CNC-machined for a precise fit, and individually inspected for quality assurance. The Ultra Series Street manifold features a generous 71mm throttle body opening and is constructed with thick walls at entry, minimizing concerns of breakthrough when port matching. Intense planning and design went into the plenum to distribute even airflow to all four cylinders under dynamic load conditions.

Placement and design of the velocity stacks were rigorously flow tested to ensure maximum delivery of air to the cylinder. Large velocity stack raised bell mouth entries lead to 6.85” long intake runners with smooth transitions allowing the Ultra Street Intake Manifold to really move some air!

Skunk2 Racing Ultra Street Intake Manifolds are designed to be used in modified naturally aspirated applications as well as mild turbo/supercharged setups.

• FEATURES:
• Modular 2pc. Design w/ Removable Plenum

• Rotatable Plenum Allows Driver-side or Passenger-Side Throttle Body Mounting

• 1.8L Plenum Volume
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• Tapered 6.85" Long High-Velocity Runners w/ Raised Velocity Stack Entries

• Generously Cast Runner Walls for Porting

• 71mm Throttle Body Opening

• Lightweight 356 Aluminum Alloy Construction

• Hi-Grade Mounting Hardware
• Thermal Gasket Included
• 2 x 1/4" NPT and 2 x 1/8" NPT Accessory Ports
• Designed for RSX PRB style cylinder heads, and can be used on TSX/RBB/RBC cylinder heads with Tractuff Coolant Bypass adapter