CSF BMW M3 High Performance Power Steering Cooler (E90/E92/E93)CSF's High Performance Power Steering Cooler is an essential cooling modification for the E9X M3 renowned for suffering from high power steering temperatures. As the power steering fluid heats up, there's a dramatic drop in pressure which reduces the effectiveness of the vehicle's hydraulic steering system. This is especially prevalent on track and is an often overlooked cooling upgrade. CSF created this solution to maintain cool fluid temperatures,