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Weird noise after S&B cold air intake install

10101 Views 9 Replies 5 Participants Last post by  Greg687, 
kench
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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blue99stroker
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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