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Increase the plenum volume by 1 or 2 liters on your Ultra Series Race intake manifold with Skunk2's new billet aluminum plenum spacer. This spacer kit includes bolts and a gaskets to fit the Skunk2 Ultra Series Race intake manifold for either the B or K-series. The stock spacer on the S2 Ultra Manifold is great for applications that are trying to hit 600 horsepower or below. Adding a 1 liter Plenum spacer allows more airflow and is good for applications aiming for 600 to 1000 horsepower. And for those that are looking to make above 1000 horsepower, the 2 inch spacer is recommended.