What is Modular Systems?
Modular Systems is the conceptual successor to Modular Furnace. Its more of an expansion to the idea of modular multi-blocks. The original Modular Furnace mod is included as well as other modular systems.
The Modular Systems Mod enhances a few blocks to better improve their functionality.The furnace expansion allows you to upgrade the furnace to improve smelting/cooking time, use less fuel per cook, or multiply your outputs. It will improve depending on what type of blocks you use to assemble it. You need to build at least a 9x9x9 cube with the center empty and the front center block as the modular furnace. With Cobblestone this will just act as a slightly improved furnace. But if you built with diamond blocks it will significantly increase the speed at which it outputs.
Download this mod here: Modular Systems Mod