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Discussion Starter #1 (Edited)
So when I let off the go pedal, I get a cross between a cat hissing, and whoosh of air coming from the truck. It lasts for like a second.

I thought maybe I was hearing turbo noise that I couldn't hear before the 4" turbo back exhaust, but then I read it is air coming out of the larger aftermarket intake.

Can anybody confirm that?

It is really loud when shifting into OD/4 under load while pulling my toy hauler.

Sounds similar to this guy's video:
 

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It's normal. It's just air coming back out.
The stock box does it but it's enclosed so you don't hear it.
It's not the wastegate. The wastegate doesn't make noise.
 

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^ like blue said.

The only downside is you may want to floor it and let your foot off the pedal just so you can hear that noise ?


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