works very well. i know it doesnt look like i covers the whole turbo but it does very well, and is held up great over the years. i had one last over 8 years from PTP. these are the good ones
With an outer layer made from silicone impregnated fiberglass, these turbo blankets are internally insulated with high temperature calcium magnesium silicate wool, overlaid with a high temperature mesh. The PTP Subaru Turbo Blankets are designed to fit all stock Subaru WRX/STI turbochargers. They also can fit many other after market turbochargers with internal wastegates.
Subaru WRX Turbo Blanket - Heat Tolerance:
Interior Surface: