 Try to remember some of the basics of CQC. It's the same reason that you sleep with one. This and this serve the same purpose. They both function as insulation to keep the heat from whatever they're covering from escaping. So just like a comfy blanket uses your own body heat to keep you warm, a turbo blanket keeps the heat from the exhaust flowing through the turbo in the turbo. But why is that a good thing? Many times modifications in cars do the opposite. We often think about avoiding heat, not maintaining it. Simple. The whole reason turbos exist is to make use of the kinetic and thermal energy in the exhaust gases leaving the engine. That usable energy is a product of heat. So the job of a turbo blanket is to ensure that less of that potential energy is wasted from convection due to airflow over the turbo or radiation to cooler engine-based surfaces. So when you save that heat, what does it get you? Quicker turbo response, higher low and mid-range boost, and more torque. Plus a huge cherry on top is the added benefit of lower engine bay temps all around, which prolongs the life of heat-sensitive materials like vacuum lines and helps to support other parts into the hood that do the opposite job of keeping things cool, like your radiator, your intercooler, even the compressor housing on the turbo that's right next to it.