This AEM Universal Exhaust Back Pressure Sensor Install Kit is perfect for car enthusiasts and mechanics who want to get accurate air/fuel ratio readings. It's used in vehicles with turbo systems, specifically when you need to measure exhaust back pressure from pre - turbo wideband O2 sensors. The kit comes with a high - performance stainless steel 100psig pressure sensor, a stainless steel standoff tube, and a stainless steel braided hose with fittings, all designed to last under tough conditions.