I assume this relates to some of the older models.
I just got off the phone with shimano, and was told the reel would have to be shipped back to shimano in cali and they would install it, if your reel doesn't already have it. Rep i talked to was unsure if my reel already had the better drags in it or not being purchased last year. But i do remember it saying 22lbs drag when i got it.
i may just send it in come the winter for servicing and see what happens.
Shimano® is also offering a free drag system upgrade on Trinidad® 16N, 16, 20, 30 and Torium ® 16, 20 and 30 to anglers who need more drag range. Please contact customer service @ 1-877-577-0600.
Found here :
Clicky, bottom of page 1