Extrusion dies for honeycomb body

An extrusion die having an input surface and an opposing output surface, the extrusion die comprising:

• a feed hole plate forming the input surface and comprising feed holes extending from the input surface toward the output surface;
• an array of substantially parallel pins extending from the feed hole plate and forming at least a portion of the output surface;
• discharge slots at least partially defined by opposing first surfaces of adjacent pins, the discharge slots having a slot width (SW) and a slot length (SL), and extending from the output surface toward the input surface;
• and
• a plenum fluidly connecting the feed holes and the discharge slots, the plenum comprising:
• first chambers at least partially defined by opposing second surfaces of adjacent pins, the first chambers extending from the feed holes, the first chambers having a first chamber width (CW1) and a first chamber length (CL1);
• and
• second chambers at least partially defined by opposing third surfaces of adjacent pins, the second chambers extending from the first chambers to the discharge slots, the second chambers having a second chamber width (CW2) and a second chamber length (CL2),
• wherein the first chamber width CW1 is greater than the second chamber width CW2.