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A lot of the time, you'll hear someone talking about how much hotter the exhaust system on a turbo car gets than a naturally aspirated car. Well, if you are catching my drift so far, you'll know that this is a bunch of BS. The temperature of exhaust gas is controlled by air/fuel mixture, spark, and cam timing. Not the turbo hanging off the exhaust manifold.
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Where do you get your information cuse that's all wrong, the high rpms of the turbo itself generates heat as does the added backpressure. A free-flowing exhaust is cooler because heat doesn't build up it dissipates with a turbo in place the exhaust doesn't flow as freely as stock and heat doesn't dissipate as fast with the turbo in the way.