Skunk2 Racing 16-21 Civic 1.5T Ultra Street Intake ManifoldUltra Series Manifolds ensure optimal intake performance for maximum horsepower gain versus traditional single piece intake manifolds. Our modular cast aluminum intake manifold can be easily disassembled for ease of porting, cleaning, and plenum volume changes via the use of our separately sold spacers. The expandable plenum gives the ability to perfectly curate intake air flow and volume for to maximize application potential. Skunk2 Ultra Series