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Cooler engine bay temps mainly, well that's the reason I bought one some profess the expanded hot gas spools faster notion, but for me I want to reduce heat intrusion into the engine bay
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On the WRX I have a black one but have used a larger D type blanket over the top as a heatshield substitute. Makes a massive difference to the heat, so much so you can touch the outside of the blanket and it just feels warm