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6.7 exhaust brake whistle


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hello agin everbody. Its been awhile since ive been on the forum so to catch yall up i blew up my 05 and now bought a 2012 3500. So anyways i love the new ride, and yesterday i installed the h&s mini max with a flo-pro tbe. As soon as i installed everything i started it and the mechanic helping me turned on my exhaust brake and the turbo whistled the 6.0 powerstrokes. loved it! It did it the first two times i started it and now it wont. Did something break? Any help would be appreciated these 6.7 are greek to me.

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no at idle. it was warm outside too but the truck hadnt been started in a couple days, thats good to know that its only when its cold. As for driving,the exhaust brake works perfect.

Yup, that's the weather temp. I believe it's 50 some degrees when the turbo wont whistle when on idle. The whistle means the turbo is engaged. It causes more work for engine when it's cold to warm it up faster. It's designed that way.
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