The most common cause for VorTech noise is a dirty wetside. It's very important to disassemble and clean your wetside regularly. Regular maintenance will prevent noise or potential damage to your wetside. To clean your wetside, start by soaking the wetside only in a 50/50 mixture of hot water and white vinegar. From there, completely disassemble and clean all components. For more information on disassembling your wetside, please reference the video links below.
MP40wQD: MP40wQD Wetside Dis-assembly Video