Funk Motorsport - EXTERNAL WASTEGATE BLANKETA wastegate blanket works in a very similar way to a Turbo Jacket. After all, they experience very similar conditions to turbos. Both have High flowing exhaust gas through them and both emit high temperatures and heat energy. This hot surface area can over time cause a wastegate issues or boost creep due to the internal diaphragm becoming weak and failing. A better protected wastegate can ensure a more consistent performing turbo for a longer lifespan