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Yup, just as Joshinator said, to keep the heat down in the engine bay as much as I can. With the modifications I have been making and plan to make the 2.0T is pretty stressed out...it gets hot in that engine bay!
Additionally, keeping the heat in the pipe raises the speed of sound and theoretically will help performance...but I doubt it’d be anything noticeable.
Also, ceramic coating is just cool :-)
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