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:help: just put on a 4" turbo back no cat magnaflow kit. im liking it so far, but noticed at idle a hissing noise. at first i was thinking great gotta go back because of a leak. but went back and they said it was normal. well... is a hissing noise normal? (duramax LLY)
 

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Yes, it is normal. If you listen it will change to a deep sound and then hiss again. Its the turbo everyone says.
Dan
 

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Completely normal, it's the veins in the turbo closing.
 
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