I have a x738 with a 60HC deck that is side discharge. I have over 3 acres I mow. Around my house I have nice fescue grass I mow often. The rest is a field with brome grass mixed in with weeds that I don't mow often. It usually gets 12 inches or taller before I mow the field.
I was thinking of getting a mulching kit to avoid clumps of grass around my house. When I mow the field area I have the mower deck height up all the way to avoid hitting dirt mounds and hidden sticks since the land is uneven. I don't really care about leaving grass clumps in the field. How tall of grass can you mow without bogging down the mower with the mulching kit if I leave the deck height 5+ inches?
I just found a new style of mulching kit that you can open the side discharge by flipping a lever. Part # BM25258. I think it supposed to fit 2015 and newer 60hc decks. Mine is a 2016 but Im going to check my deck model number before I order the kit.