Pracworks Honda K-Series Intake Manifold 20° PlenumOur PracWorks Carbon Intake Manifold for Honda K series. An Intake Manifold that outperforms Honda Civic Type R RRC intake manifold. Dry Carbon Construction Billet 6061 T6 flanges Dyno tested to make 10 15hp gains Compared to RRC Intake Manifold Designed for Mid to High Rpm Power Gains. Ideal for Street Track Application 6 liter plenum volume Safe on boosted engine up to 70psi 3 in 1 Bolt Pattern on Throttle Flange (PRB RBC J37) up to 76mm. Optional