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After I shut down my 96 there is a hissing sound at the front of the truck. Is it the cooler letting off pressure? Thanks
 

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Most likley you are hearing the air conditioner pressures equalizing. at idle and shut down there is no boost pressure.
 

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It could just be your turbo spooling down. I know after i took off my ilencer ring put on a BHAF and straight piped it (all at the same time) i could hear what i guess you could call a hissing sound of the turbo winding down.
 

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Most likely the turbo spinning down. Mine does it. I also noticed it more after removing the silencer ring.
Ryan
 
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