Docc's experience shows that the standard V11 oil pump is durable and well suited to the V11 engine. If someone is keen to replace it with a different design, then fine, but for normal use, it may not offer any benefits. A higher capacity pump will absorb proportionally more engine power, and surplus pressure will be dumped by the relief valve. The standard pump still has enough capacity to allow use of the oil cooler (if the oil temp gets above 70degC, which is not happening this winter around here).
Guzziology says GU 30146400 pump (fitted to the V11) has been around since 1991. It has 16mm width gears instead of earlier 14mm gear pumps, but the oil pressure relief stayed the same.
This pump not the same as the 21mm Daytona/Centauro pump, which is not only bigger, but spins faster. Dave Richardson says "these pumps fail at about 35000km because of the lack of a bearing on the driving shaft. A favorite solution was to copy the MGS01".
16mm V11 OEM pump https://www.af1racing.com/store/Scripts/prodView.asp?idproduct=46944&sku=GU30146400&description=Oil+Pump+-+GU30146400
15mm gear aftermarket V11 pump. https://www.mgcycle.com/index.php?main_page=product_info&products_id=1985