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Hi I have a 2008 Dodge Ram with a 6 speed manual 3.7l motor, there is this hissing noise that I can not figure out. I posted it on YouTube and put the link at the end of the post. The noise happens on cold starts and as the truck heats up the noise gets less audible but never fully goes away. Have had the noise happen to me for the past 2-3 years nothing seems to be wrong with the truck mechanically and there are no warning lights light up on the dash. I'm not too concerned with the noise as it has been happening for years and no issues have come from it to my knowledge but if anyone knows what it could possibly be let me know because I'd rather not have a hissing truck. Thanks ahead! https://youtu.be/tb_a-SOngUc
 

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Have you checked for an exhaust leak?
 

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Discussion Starter #3
No I havent, I might try to have someone cover the tailpipe and try to listen for a difference in sound from under the cab.
 
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