Turblown Cast Rotary Upper Intake ManifoldTurblown Cast Aluminum Upper Intake Manifold is designed for modified turbo rotary engines looking to maximize their power gains. Vehicles above the 400rwhp, especially those with larger ports gain noticeable power increases averaging around 5 10+%. This is a direct bolt in unit, that will bolt to the OEM 13BREW lower intake manifold, or any after market LIM using the OEM FD3S flange. FC3S engines require an adapter, and FD3S throttle body( not