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This stuff actually makes a huge difference. On turbo cars, heat energy is one of the key ingredients in spinning a turbine. More heat, the faster it spins up, the less lag and transient response. That being said, you really can't measure the difference between a wrapped and unwrapped manifold, but it is there. Plus, it keeps the heat from getting into your engine bay, reducing ambient engine bay temps and subsequently intake charge temps.
Wow dude it's cool to see you on here. Love your channel!