The Skunk2 Ultra-Race Series Billet Intake Manifold, for Honda K and B series engines is the ultimate manifold for high-horsepower street and race engines. Unlike the standard Ultra Manifold, the Billet Ultra was designed for 8-injector mounted top-side with a single fuel rail.

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 a large plenum favors maximum top end power over lower end power and response. After all of our in-house testing, and also third party dyno testing, we have yet to see a intake manifold that comes close to the performance of the Skunk2 Ultra Race Manifold.

The manifold features the same Skunk2 Ultra high flowing runners and modular plenum design. The modular design allows plenum volume to easily be increased using simple spacers, and the runners can also 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.

The combination of the billet coolness-factor with limited production makes the Skunk2 Billet Ultra Race Manifold special offering.

*Does not fit K20C variants


  • Best in Class Power Increase
  • Single Rail Top Mount 8-Injectors
  • Tapered Hi-Velocity CNC Billet Intake Runners
  • Modular Removable Plenum Design
  • Plenum Volume Can Be Adjusted Using Spacers
  • 90mm Throttle Body Flange - Std. 5.0 Ford Bolt Pattern
  • Thermal Gasket Included

Vehicle Fitment

  • 2002 - 2005 Honda Civic (2.0L Si K20A2 Style)
  • 2002 - 2006 Acura RSX (2.0L Base/Type S K20A2 Style)
  • 2004 - 2006 Acura TSX (2.4L Base K20A2 Style)
SKU X307-05-0400
Brand Skunk2
Shipping Weight 9.0000kg
Shipping Width 0.530m
Shipping Height 0.380m
Shipping Length 0.230m
Shipping Cubic 0.046322000m3

Related products

More From This Category

Skunk2 - Pro Series Intake Manifolds
SKU: 307-05PS

Skunk2 - Pro Series Intake Manifolds

From $556.00

or 4 payments of $139.00 with Learn more

Variation Product For Stock

307-05-0300 - 5+ in stock

307-05-0265 - 5+ in stock

307-05-0300 - 3 in stock

307-05-0260 - 2 in stock

307-05-0275 - 5+ in stock

307-05-0290 - 5+ in stock

307-06-0505 - 0 in stock

307-05-0320 - 0 in stock

307-05-0280 - 0 in stock

307-05-0310 - 5+ in stock

In Stock - Ready to Ship See Options