Ultra Race Centerfeed Intake Manifold - K20A2 Style

The Skunk2 Ultra-Race Series Intake Manifold for Honda K20A/K20A2/K20Z1/K24A1 Engines is the preferred manifold for high horsepower street and race engines. All Ultra manifolds feature tapered runners with trumpet profiled entries and plenums that have been designed and optimized using CFD and on the dyno. The short tapered high volume runners combined with an oversized plenum runners favors maximum top end power over lower end power and response.

The Skunk2 Ultra Race Manifold is cast as a two-piece manifold from aircraft grade A356 aluminum, and features provisions to mount secondary injectors underneath. The modular design means the plenum volume can easily be increased using simple spacers, and the runners can be freely ported for additional flow and volume. The versatility of this manifold allows enthusiasts and engine builders to tune the manifold combination to best suit their needs.

Recommended for high-performance naturally aspirated engines up to 450hp, and turbo/supercharged engines from 650hp and up.

Each manifold is vacuum tested and finished-off with our Signature Skunk2 Pro-Series nameplate.

Features:

• Lightweight 356 Aluminum Alloy Construction
• Modular Design with Removable Plenum
• 5.0L Plenum Volume
• 90mm Throttle Body Flange - Std. 5.0L Ford Pattern
• Tapered 6.0" High-Velocity Runners w/ Raised 87mm Velocity Stack Entries
• Generously Cast Runner Walls for Porting
• Provisions Secondary Fuel Rail & Injectors
• 3 x 1/8” NPT and 3 x 1/4” NPT Accessory Ports

**Optional Billet Aluminum Plenum Spacers Available in 1L or 2L Sizes

The K Series Ultra Race Manifold uses the EARLY PRB/ PRC style cylinder head and throttle body mounting flange pattern but can be installed on the LATE RBC/ RBB style cylinder heads through the use of an aftermarket Water Bypass Adapter and associated throttle body or throttle body adapter.

RACE APPLICATIONS ONLY - NOT INTENDED FOR STREET USE

• 3.5 Liter > High Horsepower N/A and Forced Induction Applications to 600HP
• 4.5 Liter > 600-1000HP
• 5.5 Liter > 1,000HP Up

Optional Billet Aluminum Plenum Spacer Available:

• Ultra Race Plenum Spacer Silver - 1L (P/N 907-05-9001)
• Ultra Race Plenum Spacer Black - 1L (P/N 907-05-9051)
• Ultra Race Plenum Spacer Silver - 2L (P/N 907-05-9002)
• Ultra Race Plenum Spacer Black - 2L (P/N 907-05-9052)

***Modification required on vehicles using OEM Idler Pulley & Water Pump Housing***

Recommendations:

Fuel Rail:

• Ultra Street Fuel Rail - (P/N 350-05-7000)

Throttle Bodies:

• Pro Throttle Body 90mm Silver - (P/N 309-05-0900)
• Pro Throttle Body 90mm Black - (P/N 309-05-0905)

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:

• PRB Throttle Body into Ultra Manifold - (P/N 309-05-0025)
• RBC Throttle Body into Ultra Manifold - (P/N 309-05-0010)
• TPS Adapter K to B - (P/N 309-05-0100)

Thermal Gaskets:

• Intake Manifold Gasket (PRB) - (P/N 372-05-0350)
• Throttle Body Gasket Pro 90mm - (P/N 372-99-0090)

US Patent: D677700