Photos shown for illustration; shade and shape may differ slightly.
Skunk2 Ultra Race 5.0L Centre Feed Intake Manifold for Honda K20A, K20A2, K20Z1 and K24A1 Engines
The Skunk2 Ultra Race intake manifold is made for race engines: a 5.0 litre plenum, short tapered runners and a 90 mm throttle body flange. It favours peak power at high rpm, on Honda K20A, K20A2, K20Z1 and K24A1 engines.
Specifications
| Brand | Skunk2 Racing |
| Code | 307-05-8080, 307-05-8085 |
| Material | A356 aluminium, cast |
| Construction | Modular, removable plenum |
| Plenum volume | 5.0 litres |
| Plenum feed | Centre feed |
| Throttle body flange | 90 mm, Ford 5.0 pattern |
| Runners | Tapered, 152 mm, with 87 mm velocity stacks |
Which cars it fits
- Honda Civic Si 2002-2005 and Integra DC5 / Acura RSX 2002-2006
- Any swap using K20A, K20A2, K20Z1 or K24A1 engines or heads
- Honda Civic Type R EP3 (K20A2)
What to check
- Skunk2 lists it for racing only, not for road use.
- Pick the plenum by power: 3.5 litres up to 600 hp, 4.5 litres for 600-1000 hp, 5.5 litres above 1000 hp. 1 and 2 litre spacers are sold separately.
- It has provisions for a second set of injectors underneath.
- It uses the PRB / PRC flange; on RBC / RBB heads it fits with a water bypass adapter and a suitable throttle body or adapter. Cars with the factory idler pulley and water pump housing need modification.
- The centre feed moves the throttle body forward, above all the runners, so air reaches the cylinders evenly; it works best on high-rpm naturally aspirated and boosted engines.
- Skunk2 recommends it for naturally aspirated engines up to 450 hp and turbo or supercharged engines from 650 hp up.