That modified intake looks very familiar! - does the volume of the intake change - no not really. The Indy intake has a domed lid and the top does not rest or seal to what you are seeing in the picture - does this modification increase horsepower? the answer was yes on the dyno it did - it also moves the torque curve by a few hundred RPM - on track no real difference but that may be more indicative for the need to make a converter adjustment to accommodate the changed torque curve

The Modification is meant to direct the fuel charge to the runners and help with fuel charge falling out of suspension and puddling along the sides - the floor was not raised - you will notice drain back holes under the added plates to dissipate the fuel puddles