You have to consider the whole package. In a full race environment, the Indy or a single plane would be better. With a street cam, and maintaining lower rpm, you don't need that big a manifold. The Indy will flow more for higher rpm, but you will sacrifice bottom end torque and throttle response. So I guess it depends on your usage. I've always considered street use as "light to light" driving. Where lower rpm acceleration would be beneficial.