Just wanted to let everyone know how happy I am with the quite drive upgrades. I figured I would try one of my pumps first before pulling the plug on two sets of drivers and wet sides. I picked the loudest MP40 WES that I had ( it was actually annoying how loud it was) and upgraded the driver and the wet side. I have it running on Nutrient Transport at 100% and I literally can not tell it is running. I am very happy. Great job on an excellent product.