Engine puff when I turn it off (sometimes) - 08 Yukon Denali

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Volant1

Volant guy
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Intakes make power mid to high rpm which is why it seems like there is a pause than a rush of air, you don’t hear this with the factory unit because the resonator tubes that sit on top of the engine they store air for the low end and also quite the system down. The sound you here when you shut the motor off is the unused air being released out of the intake system it is normal.
 

ChevyGuy

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Agree with Volant. My Silverado did the exact same thing.
 
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plush

plush

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thanks, that puts one issue under the table, next on to the shift issue.
 

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