The problem with the current bolt-in lumps is that they are designed to fit a stock unported intake port. So adding a divider will naturally require the ports to be widened by some amount and even possibly raised to compensate for the narrow window that is created by doing it. Also maybe a completely new design lump that is also a little shorter. The last style of brazed in lumps we raced was shorter than the bolt-in style is already, and didn't have a teardrop face shape and produced the most HP and airflow gain over the previous ones, so there is a lot of upgrading and updating that can be done to them if someone really wanted to make a better mousetrap.
