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the RL and the TYPE I intake manifolds are designed for torque.
The Type I's runner length is increased but adding that extra bit of metal there.
the Type II removes that surround on the intake runners. those runners are then able to grab from more area and the point at which the air constricts itself in the runner and is pulled into the intake valve is shorter.
the Type II is better for High RPM engine running. it's more of an "open" manifold than the Type I which is more of an open (albeit narrower) manifold than the RL. The RL should flow more than the Type I but the Type II has a higher RPM power range than the RL.
Type II for high RPM.
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