This turbo blanket is specifically designed for factory Subaru turbo applications. It gets some pretty solid coverage of the turbine housing. At the time of install we were going through some major Texas weather changes so it is hard to say what my intake temperature differences were, but I feel confident that it is doing a decent job isolating the excess heat.
It's worth noting that you're probably going to want an extra set of hands for this if you plan on leaving the turbo mounted up in the car. It's a bit of an art.